What do you think about using engine oil with more specifications than it is recommended on the car's manual? Is it okay to use diesel engine oil on a car that doesn't run on diesel?
No, not really. They have additives for diesel which are different from additives for a gasoline engine. They are completely different environments inside diesel engines and gasoline engines. For gasoline cars, stick to the oil that is made for gasoline engines; and for diesel cars, stick to the oil made for diesel engines. You don't want to switch the two up. These engineers spent a lot of time designing and testing and they know what they are doing. You don't want to cross wires with the stuff that they already tested out.
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