DES57 I don't know if I should do this but I top off my oil level with 10w40 used break in oil from a 4x4 540 pulling truck. I let it settle out for weeks then carefully pour off a quart (looks fine) now that racer is as clean as we can soap and water get it. The break in oil is full of zinc and so far over 11,000 miles cam is fine...I hope,haven't seen it since bearing change.