Rotella oils like T3 15w-40 meets both the API CJ-4 and SM specifications, and may be used in both gasoline and diesel engines. … However, it is formulated…

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Others lean toward higher-viscosity oils to protect against wear. Some want to run a 15W-40 oil in their gas engine, and it’s often easier to find a 15W-40…

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As little as 1% gasoline contamination will lower the diesel flash point by 18 degrees C. This means the diesel fuel will prematurely ignite in the diesel engine,…

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