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I am new to The Deisel engine. I have a Sierra GMC 2500HD with the Duramax deisel engine. I have used Castrol Oil in my gas engines and have gotten over 279,000 miles on two separate cars. Can I use Castrol GTX High Milage 5W/30 oil in my deisel ? :cool:

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Welcome :cool:

I wouldn't use 5W-30.The diesels call for 15W-40,Thats all I would use.

I know that under extreme cold temps. (Under 0 degrees) You can use 5W-40.

See the attached owners manual section........



Document ID# 926300


Engine Oil


6.6L V8 Turbo Diesel (LB7) Engine©


FIGURE 6.6L V8 Turbo Diesel (LLY) Engine©



What Kind of Engine Oil to Use

Look for these two things:


CI-4 or CH-4 Oils designated as API CI-4 or CH-4 are recommended for your vehicle. The CI-4 or CH-4 designations may appear either alone, together or in combination with other API designations, such as API CI-4/SL. These letters show American Petroleum Institute (API) levels of quality.

Notice: Use only engine oils that have one of these designations, CI-4 or CH-4, for the Duramax® diesel engine. Failure to use the recommended oils can result in engine damage not covered by your warranty.


SAE 15W-40 As shown in the viscosity chart, SAE 15W-40 is best for your vehicle. However, you can use SAE 10W-30 at temperatures above 0°F (-18°C). When it is very cold, below 0°F (-18°C), you should use SAE 5W-40 to improve cold starting. These numbers on the oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 10W-40 or SAE 20W-50.





This doughnut-shaped logo (symbol) is used on most oil containers to help you select the correct oil. It means that the oil has been certified by the American Petroleum Institute.


You should look for this on the oil container, and use only those oils that display this logo.


GM Goodwrench® oil of the recommended viscosity grades meets all the requirements for your vehicle.






Engine Oil Additives

Do not add anything to your oil. The recommended oils with the API service symbol are all you will need for good performance and engine protection.


When to Change Engine Oil (GM Oil Life System)

Your vehicle has a computer system that lets you know when to change the engine oil and filter. This is based on engine revolutions, engine temperature and on a maximum mileage of 10,000 miles (16 000 km). Under severe conditions, the system may come on before 10,000 miles (16 000 km). For the oil life system to work properly, you must reset the system every time the oil is changed.


When the system has calculated that oil life has been diminished, it will indicate that an oil change is necessary. A CHANGE ENGINE OIL message will come on. Change your oil as soon as possible within the next two times you stop for fuel. It is possible that, if you are driving under the best conditions, the oil life system may not indicate that an oil change is necessary for over a year. However, your engine oil and filter must be changed at least once a year and at this time the system must be reset. Your dealer has GM-trained service people who will perform this work using genuine GM parts and reset the system. It is also important to check your oil regularly and keep it at the proper level.


If the system is ever reset accidentally, you must change your oil at 10,000 miles (16 000 km) since your last oil change. Remember to reset the oil life system whenever the oil is changed.


How to Reset the CHANGE ENGINE OIL Message

To reset the CHANGE ENGINE OIL message, do the following:


Turn the ignition key to RUN with the engine off.

Fully press and release the accelerator pedal slowly three times within five seconds.

If the CHANGE ENGINE OIL message flashes for five seconds, the system is resetting.

Turn the key to OFF.

If the CHANGE ENGINE OIL message comes back on when you start your vehicle, the engine oil life system has not reset. Repeat the procedure. If it still does not reset, see your dealer for service.


What to Do with Used Oil

Used engine oil contains certain elements that may be unhealthy for your skin and could even cause cancer. Do not let used oil stay on your skin for very long. Clean your skin and nails with soap and water, or a good hand cleaner. Wash or properly throw away clothing or rags containing used engine oil. See the manufacturer's warning about the use and disposal of oil products.


Used oil can be a threat to the environment. If you change your own oil, be sure to drain all the oil from the filter before disposal. Never dispose of oil by putting it in the trash, pouring it on the ground, into sewers, or into streams or bodies of water. Instead, recycle it by taking it to a place that collects used oil. If you have a problem properly disposing of your used oil, ask your dealer, a service station or a local recycling center for help.



Document ID# 926300

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  • 3 weeks later...

Thank You Very Much MS3DALE for your reply to my post. :cheers:



I am new to The Deisel engine.  I have a Sierra GMC 2500HD with the Duramax deisel engine.  I have used Castrol Oil in my gas engines and have gotten over 279,000 miles on two separate cars.  Can I use Castrol GTX High Milage 5W/30 oil in my deisel ? :eek:




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