I've had my M1 10W30 used oil tested at an oil analysis lab and found the wear properties and shear breakdown to be fine, well within expected norms. This is over last winter and again this spring. I have also run Amsoil 10W30 as well, alternating with Mobil1, depending which is cheaper at the time.
Have you tested your 15W50 or going by a 'gut feeling'?
Regards,
My Zs are hybrid vehicles, they run on gasoline and money
times change, people change, but the Z32 still kicks ass. - apudapus 16:46:02 06/15/07
I was more wondering how you set your climate control to 22* lol, it would be that fastest freezer on wheels! - Briscoe'sZ32 (NJ) 23:15:44 02/05/07
You have *got* to be getting a cut from B&B :D - SeedyROM 15:24:29 08/16/06 What do you think B&B stands for? - YugoBernie (NoVA) 15:57:09 08/16/06