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Cut the oil filter open and observe is another trick. I think any diesel rated oil will work, 15-40w, provided you don't run it in single digit temperatures.

The correct engine oil is 10-30w with a zinc additive for your flat tappet camshaft. To check your coolant, park generator on a level surface, with the engine cold. Remove cap and stick finger in radiator to verify coolant level. If you can't feel it, then it's low. I use a suction gun to...