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First, regardless of which oil weight you use, you need to ensure that it's oil engineered specifically for diesel engines - do not oil for gasoline engines, which is not engineered for the higher temperatures produced by diesel engines. In North America, that would be any API CJ-4 rated diesel oil.

15W-40 tends to be used as a "default" in many places... to go up to a 30W would typically require an environment with extremely high temperatures. And, without knowing which engine it is, we have no way of knowing how tight the tolerances of that engine are... if it's an engine of extremely tight tolerances, you don't want to go with anything heavier than the OEM recommendation.

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8y ago
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8y ago

Don't know what diesel engine you have or the climate you live in. Follow the manufacturer's recommendation.

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Q: Can you use SAE 30 engine oil to diesel engine?
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