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new to me::84 240 diesel issues 200 1984

The owners manual recommends 15W40 for temperatures above 20F for gasoline engines. (I don't have one for a diesel) I would think the same thing for a diesel. Make sure it's CD rated (Rotella, Delo, etc.) 10W30 is too thin if the temperature is over about 80, especially if your cooling system is having problems and it's running on the hot side.






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