All, I've been reading all the recent posts on the MC oils. Picked up the bottle a few times at WalMart and then set it back down. My only reservation is about trying the 5w-20 instead of using the 5w-30 that is recommended for both engines listed in the subject line. (Been using Castrol GTX 5w-30 in both). Question: If the thinking is that this particular oil is 'almost' a 30 weight, would it be okay to try in these engines? IS it 'almost' a 30 weight? Would YOU try it??!!! Better oil than the Castrol???? Any and all opinions/assitance welcome!!!! Thanks, Ashley p.s. Live on the gulf coast and make lots of short trips in both vehicles. 3k OCI on both. 140k on the Jetta and 55k on the Saturn.