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can you mix heavy duty oil with regular?

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Old 05-31-2013, 04:51 PM
6.5bigredmonster's Avatar
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Default can you mix heavy duty oil with regular?
i am running heavy duty oil in the truck now just wondering if i can mix the two, or will it cause harm? thanks
 
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Old 06-01-2013, 02:57 PM
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I have mixed 15/40 and 10/40 and never had any issues.
 
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Old 06-01-2013, 06:49 PM
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Dont worry about it bro. It'll be fine.
 
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Old 06-02-2013, 10:56 AM
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Just don't mix gasoline only oil with diesel rated oil,there is a lot of info here but suffice to say any oil you put in a diesel must have a C- in the API circle,if there are only S designations it is gasoline only:
Motor oil - Wikipedia, the free encyclopedia
 
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