So I have used mobil 1 0w40 for one OCI (4,000 miles) so far and Im doing the second oil change on it in a couple days, before I send it to be analyzed. I was reading the VOA of it and everyone was arguing about it shearing into a 30 weight.... Is this supported by anything? If an oil shears, does it protect less? I have nightmares about getting scored cylinder walls. Post in question... http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/1722539/1 Am I worrying over nothing?