Max is off the meds again. Diesel against a gas motor, Diesel
oil is not the same as normal car
oil. Depending on the bearing hard ness, yes you can scratch the COATING on the bearing, not the metal or tri metal surface itself. You are right about cranking a motor with no
oil pressure. This is why some oils are clinging oils that keep the surface coating for weeks. The crank doesn't rub metal to metal on these surfaces. Max get some rest and take your med's. Ant hills can be 30' high, mole hills 6-8', not sure about what mountain range you are thinking but it's not that important. Rick L.