At what interval should I change the oil in my car ?

You should follow the change interval as recommended in the owner’s manual. A good general rule is to change the oil every 5000 km, or every six (6) months whichever comes first.


What does the "W" mean in 15W40 ?

The "W" stands for winter, and designates that the oil is suitable for colder climates.


Is Master Oil equal in quality to the oil marketed by the multinational oil companies ?

Yes, it is the same basic oil that is sold by the multinational oil companies. The only difference is the label, and the price which is usually lower than the international brands.


What does oil do ?

Whether it’s in the engine or around the gears, the purpose of oil is to reduce the friction between 2 metal surfaces. It does this by sticking to each surface and forming a thin film that keeps the 2 metal components apart. The parts effectively 'float' on a thin film of oil which stops metal to metal contact reduces friction, heat and wear. The quality and performance of oil is a measure of its ability to perform these functions over a long period of time thereby increasing the reliability and performance of the engine components being lubricated.


Which oil do I need for my car ?

This is an important question as the correct oil specification will have a significant effect on the performance, reliability and fuel economy of your vehicle. Lubricants are becoming more and more complicated and specific to particular engine types. You need to use the correct viscosity, match the industry standard and follow the manufacturer specifications. Selecting the wrong oil can cause major engine damage and reduce fuel economy, adding to running costs. Using cheap low quality oil is a false economy. Contact Master Oil to find out about the correct engine oil for your vehicle.


What does the 'viscosity' of an oil mean ?

Viscosity is an important criterion of any lubricating oil. It is a measure of a fluid’s thickness or resistance to flow. For example, honey is thick and water is thin, so honey has a higher viscosity than water. Oil viscosity needs to suit the right ambient temperatures. If it’s too thick when the engine is cold, it won’t move around the engine. And if it becomes too thin when the engine is hot, it won’t give the right protection to the engine parts.


Optimizing an oil’s viscosity, or thickness, helps maximize energy efficiency while avoiding component wear.


Viscosity modifiers increase the viscosity of your oil at high temperature but have little effect on low-temperature viscosity. These enable your oil to flow properly when cold and also to remain thick enough to protect your engine components at high temperatures.


Lower-viscosity grades of oil such as (write our LV grade), make it easier for your engine to start from cold because they present less resistance to moving parts and hence take less power from your engine. This also means that you get enhanced fuel economy.


What are performance additives ?

Performance additives give extra protection to the base oil and enable it to protect and clean your engine, helping it to work harder for longer. They come in several kinds that must be carefully selected and blended to give top-class performance:


  • Detergents keep your engine clean and neutralize the corrosive acids that form as fuel is burned.
  • Dispersants remove soot and sludge and hold it in the oil to prevent blockages. This dirt can then be removed from your engine at the next oil change.
  • Anti-wear additives protect your engine by forming a chemical layer between the moving parts. These additives are particularly important when motoring with high loads or during engine start-up.
  • Antioxidants help to delay the natural degradation of your motor oil, hence protecting your engine more effectively for longer.
  • Friction modifiers reduce the drag between moving parts to increase fuel economy.
  • Anti-rust additives are essential elements that prevent engine corrosion.
What is a Multi-grade oil ?

Before the 1960s, all oils were Mono-grade. Multi-grade oils have a designation in the format 20w50 for example. Multi-grade oil was made possible by the use of polymers that expand as they get hotter. Therefore a multi-grade oil can have the viscosity of an SAE20 when it is cold and the viscosity of an SAE50 when hot. This removes the necessity to change from thin oil in the winter to thicker oil in the summer, and maintains the best protection for the engine over a wide range of running temperatures. The 20w number is the cold viscosity and the 50 number is the viscosity at 100°C.


Do I need different engine oil for diesel and petrol engines ?

Generally the answer is yes for older vehicles, as diesel engine oils have higher detergency levels. It is important to refer to your vehicle manufacturer’s handbook to establish exactly which specification of oil is required. This is vital if your car has extended service intervals and you are still within the warranty period. New vehicles are designed in a way that allows the same oil to be used whether the engine runs on petrol or diesel.


Does motor oil expire? How long does motor oil generally last ?

Master Oil does not have a documented expiration date. Under optimal conditions, the product is stable for an extended period of time and can be used as long as the American Petroleum Institute (API) rating on the label continues to meet or exceed the requirements listed in your owner's manual. If the rating is still current, shake the container before use to blend any additives that may have settled.


Does motor oil ever wear out or does it just get dirty ?

Motor oil breaks down with mileage and time - the oil additives weaken as the engine oil is used. Dirt can be a factor as well. Changing motor oil on a regular basis will eliminate these factors.


Are conventional motor oils natural, unprocessed products ?

The base oils used in conventional motor oils come from a natural source and are then put through a hydrocarbon process in which the additives are blended.


Can I use motor oil in a manual transmission ?

If a manual transmission application does not call for the use of motor oil, it is strongly recommended not to use motor oil. Follow the owner's manual requirements for the correct fluid to use for your particular application.


Are all brands of motor oil basically the same ?

All brands of motor oil are not the same. Base oils, additives, etc., can be different from one brand to the next. Master Oil is the only product in Pakistan using imported Group II base oils that extends the operating life of the Lubricants resulting in less frequent oil changes.


Is switching motor oil brands harmful to my engine ?

No. Switching brands is not harmful to your engine since all motor oil manufacturers must meet the same industry standards for performance and compatibility. However, make sure you follow the recommendations provided in your owner's manual for viscosity and API category.


Do I have to change my vehicle's oil filter with every oil change ?

Yes. Master Oil recommends replacing the filter every time your vehicle receives an oil change by following the oil change frequency recommendations in your vehicle's owner's manual. This eliminates any risk of contaminants trapped by the oil filter (e.g., dirt) from re-entering the oil.


Is the bulk oil that is put in my vehicle during an oil change different than bottled oil ?

Consumers may believe that bulk oil is of lower quality than packaged product because the price is generally less expensive. However, with Master Oil, our bulk oil is the same high quality as our packaged product. The only difference is the size of the container—and the cost savings you realize in paying for one large container instead of multiple liter bottles.


Can motor oil significantly improve horsepower ?

Yes. Friction modifiers and additives help achieve this.


What are "severe" conditions ?

Severe conditions include stop and go driving, consistent idling, pulling and towing, etc.


If I don't drive in severe conditions can I change my oil less often ?

Your owner's manual should provide different oil change intervals for regular driving and severe driving applications.


Is it a good idea to let your car warm up (idle) ?

In cold temperatures, letting your car to idle for 2-3 minutes allows the oil to lubricate the engine parts thoroughly before the RPM's are increased.


If owner’s manual states my car requires API SF quality oil, I can’t use API SM quality.

Using motor oil that meets the automobile manufacturer’s warranty requirements is a key factor in developing repeat customers and safeguarding against unhappy customers with damaged engines. With all the changes in engine designs and oil formulations, determining which engine warranty requirements a given oil meets can be a frustrating experience.


The API engine oil classification system is divided into two major categories. The “S” category designates oils for gasoline passenger car engines, and the “C” category designates oils for diesel-powered commercial truck engines. The “S” series is composed of SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL and SM. SM oils provide higher levels of performance than all the other “S” oils. Oils labeled SM can be used in older engines that once required older API categories.


Does the wrong oil cause the dipstick to rust ?

No. Generally, rusting of engine parts indicates neglected maintenance or a severe-service environment that requires more frequent oil-change intervals. All high-quality motor oils are formulated to help protect against rust and corrosion. However, to maintain that protection, the oil and filter must be changed according to the recommended maintenance intervals.


I heard that when motor oil becomes dark, that means it's time to change it. Is this true ?

This is not a true oil change tip. You cannot determine the life of motor oil by looking at its appearance since it may change color for several reasons. To ensure the best quality product, the best oil change tip is to always follow the owner's manual guidelines for oil change intervals.


If Oil turns dark or black quickly does that means oil is not good ?

Nothing could be further from the truth. If the oil is doing its job of cleaning the engine, then it should be dirty when it is drained. Master Oil will start looking dirty a short time after it is put to use. In the case of diesel engines, the oil may look dirty within a few hours of operation. These are signs that the motor oil is doing its job of keeping soot, dirt and other combustion contaminants in suspension to be carried to the filter or removed from the crankcase when the oil is changed. Master Oil products have been formulated to hold these contaminants in suspension until they can be removed with an oil and filter change.


Is Thicker motor oil better for the engine and does it increase engine life ?

Instead of talking about why thicker oils are not ideal, let’s talk about why thinner oils are the preferred choice. The main reason vehicle manufacturers recommend thinner or lighter viscosity grades of motor oil is because a gain in fuel economy may be achieved with lower viscosity oil in an engine designed for the lower viscosity oil. Lower viscosity oil may help reduce internal engine friction because it takes less energy to pump the thinner oil throughout the small passages inside an engine. Any fuel mileage improvement associated with a Lubricants would be good for them, and lighter viscosity grade motor oil will make a difference.


A thinner motor oil is also essential for easy starting, particularly in cold weather, and for proper lubrication once the engine starts. Thinner oils enable more fuel economy than thicker oils; this is why OEMs specify them. Thinner oils, such as SAE 5W-30, will flow faster than heavier motor oils during start-up and initial engine operation, and will help protect the engine. The viscosity grade(s) recommended by the vehicle manufacturer depends somewhat on engine design. Engine manufacturers have spent considerable time and expense experimenting with different viscosity grades and have indicated in the owner's manual the grades they feel will best protect the engine at specific temperatures. While one manufacturer's engine may require an SAE 10W-30, another manufacturer's engine may require an SAE 5W-20 viscosity grade. This is likely due to different tolerances within the engine or other engine design factors.



1. Locate brake master cylinder reservoir. It is usually mounted on or near firewall at rear of engine compartment, almost directly in front of where the brake pedal is mounted on other side of bulkhead. Consult a professional if you're having trouble identifying it.


2. Check fluid level.


  • Newer vehicles: Most newer vehicles have a translucent reservoir with a clearly marked "full" line. If your vehicle has this style reservoir, you can check the fluid level without removing the screw-off cap.
  • Older vehicles: Most older (early 1980s and older) vehicles have a metal reservoir with a top held on by a spring-loaded clamp. Wipe the exterior of the top clean to help prevent any debris from entering brake fluid. You'll need to pry the clamp to one side, then lift off the top to inspect the level. The "full" line should be clearly marked.

3. If level is low, add brake fluid to "full" line.


IMPORTANT: A drop in brake fluid typically indicates that your brake pads have worn to the point of needing maintenance. Be sure to have your brakes checked by a professional.. Do not overfill. If your vehicle has a dual-chamber reservoir, fill both chambers to "full" line. If reservoir is extremely low or empty, it may not be safe to drive your vehicle


4. Replace cap/top. You're done!





Your vehicle shouldn't lose brake fluid in normal operation. The level drops only slightly with wear of brakes. So if the level is down there's a chance there's a leak somewhere. Consult a service professional immediately to have it addressed and avoid possible dangerous reduction in brake performance. Also, your vehicle takes a specific type of brake fluid; typically (but not always), DOT3 or DOT4. In newer vehicles, it will often say right on the brake fluid reservoir cap. If not, consult your vehicle's owner's manual.


Note: These instructions are intended as general guidelines. Please consult your owner's or service manual for specific instructions on changing the oil and filter on your vehicle.



1. Park vehicle on level surface, engage parking brake and start engine. Leave car in neutral or park. Let engine warm up and continue to run throughout operation unless vehicle's owner's manual says otherwise. (Be aware that some transmission fluid levels are checked with the engine off. Check owner's manual.)


2. Locate transmission fluid dipstick, typically near where the transmission or transaxle meets rear of the engine. It looks similar to the oil dipstick.


3. Remove transmission fluid dipstick. Wipe clean, reinsert fully and remove again.



4. Observe markings at end of dipstick. Your dipstick might have two markings for "full"—one warm, one cold. If the transmission fluid level does not come up to the "warm" line, you'll need to add transmission fluid.


5. Insert long funnel into transmission fluid dipstick hole. Carefully add transmission fluid in small increments and recheck level each time until fluid level reaches "warm" line.



6. Reinsert transmission fluid dipstick fully. You're done!



Your vehicle shouldn't lose transmission fluid in normal operation, so if the level is down there's a good chance there's a leak somewhere. Consult a service professional immediately to have it addressed to avoid possible damage to the transmission. Also, some transmissions do not have dipsticks or may require that a service professional inspect the transmission fluid level. Check the vehicle's owner's or service manual.


Note: These instructions are intended as general guidelines. Please consult your owner's or service manual for specific instructions on changing the oil and filter on your vehicle. Use extreme caution when lifting or jacking any vehicle.



1. Prepare the vehicle before you change your oil. Park it on a level surface, engage parking brake and turn off engine. If necessary, raise the front of the vehicle by driving it onto a ramp or by jacking it up and supporting it with jack stands.



2. Open hood.


3. Locate engine oil dipstick and remove (helps oil flow when draining oil before you change your oil.)


4. Once vehicle is safely and securely supported, put on safety glasses, crawl under vehicle and locate engine's oil pan. (See owner's manual for reference.)


5. Locate oil drain plug, which is a long bolt head at bottom of pan. The drain plug allows the oil to drain out of the pan while you change your oil.


(Note: Some vehicles have two drain plugs.)


6. Position a container, such as an oil pan, under drain plug. Make sure the pan is large enough to hold the volume of oil expected to drain out of the engine.


7. Loosen drain plug using box-end wrench or 6-pt. socket. Carefully remove plug by hand, making sure pan is underneath plug hole. Oil will flow rapidly from hole, but allow several minutes for all old oil to drain out. (See vehicle owner's manual for additional information.)



8. Wipe the oil pan threads and oil drain plug with a rag and visually inspect the condition of the oil pan and oil drain plug threads and gasket. Buy a replacement drain plug if you have any concerns about the condition of the plug. Replace the drain plug gasket if needed (some OEMs recommend this). Once the oil is finished draining, reinstall the oil drain plug and tighten with the correct box-end wrench or 6-pt. socket to the manufacturer-specified torque. (See owner’s manual.)


9. Locate oil filter. If the old and new oil filters are not the same, double-check the application to be sure you have the correct filter. (See vehicle’s owner’s manual for additional information.)


10. Position oil pan under oil filter to catch any residual oil remaining inside filter.


11. Loosen oil filter or oil filter cap with oil filter wrench, and allow oil to drain from oil filter.


12. Remove oil filter. Check to make sure filter gasket has come off with the filter. If it's still clinging to the engine mounting plate, remove it and any remaining residue.


13. Place a light coating of new oil you plan to use when you change your oil on the gasket of the new oil filter so it will install smoothly onto engine. (Note: Do not use grease!) By hand, install new oil filter onto engine by turning in a clockwise direction. Once oil filter gasket first contacts mounting plate gasket surface, tighten filter according to directions for your application (usually found on the new oil filter or oil filter box), preferably by hand. (NOTE: Cartridge oil filter replacement procedures may differ. See owner's or service manual for instructions.)


14. You are now ready to change your oil. Under the hood, remove the oil fill cap and pour in the correct viscosity and amount of Master Oil with a funnel. (See vehicle's owner's manual for recommended grade, specification and amount.)


15. Once you change your oil, replace oil fill cap.


16. Start engine and run at idle for minimum of 30 seconds. Carefully inspect under vehicle for oil leaks (especially by oil drain plug and oil filter). If leaks are visible, shut off engine immediately and repair leaks. 


17. Shut off engine and allow 30 seconds for oil to settle in the engine. Carefully inspect the area beneath the vehicle for oil leaks. 


18. Safely lower vehicle to level ground. 


19. Insert and remove oil dipstick to check for proper oil level, adding more oil if necessary. (See vehicle’s owner’s manual for oil capacity and recommended oil level on dipstick.) 


20. Change your oil with Master Oil as directed by product guidelines. 


Note: These instructions are intended as general guidelines. Please consult your owner's or service manual for specific instructions on changing the oil and filter on your vehicle. Use extreme caution when lifting or jacking any vehicle. 

News & Events

New Product Launch

The newly designed packing for MASTER XTRA 4T MCO is due to be launched by the end of 2013.
New products of the highest quality are currently in the development stage, which shall be a part of MASTER OIL'S product line in the coming year.


New Product Launch and New TV Commercial

The New Imported MASTER XTRA 4T-MCO is due to be launched in March 2013 along with its much awaited TV commercial.


Ramadan Cricket Tournament 2010

After the successful Ramadan night tape ball cricket tournament organized by Master Oil in 2009, where 24 teams participated, Master Oil came back with a bigger tournament in 2010 with 32 teams from all over Karachi.


Ramadan Cricket Tournament 2011

Master Oil Ramadan night cricket tournament had become the biggest tape ball night cricket tournament in terms of popularity amongst the public in 2011.National Players like NASIR JAMSHED, SARFARAZ AHMED AND RAZA HASAN also participated.