I have 13k on the clicker now in the 2500hd sierra. 6.0 engine. Seems that Mobil 1 is having its way with the truck. I'm seriously thinking of switching back to dino if this keeps up. Rear main has been replaced now twice, the oil pan gasket has been replaced once. The oil pan gasket will need replacing again, as well as the rear main again. I had these same problems in my last truck running mobil 1. Front cover, oil pan, rear main, front main leaked like crazy until I changed back to dino then the leaks stopped. I figured with it being a new truck and having M1 since 500 miles it shouldn't be a problem. Maybe I should go back to dinoooo.?