Originally Posted By: Turk
Originally Posted By: A_Harman
Wow! Viscosity starts out at ~13.5, and ends up at 10.6. Lost 20% of its viscosity, and sheared out of grade. There is not enough fuel dilution to account for that. Maybe the balance shafts are beating up the oil? But anyway, the oil ended up as a nice 30-weight, which is what the engine calls for. It sheared the 30-weights down to 20, and that's not so good.
EXACTLY.
I wouldn't go too long on this fill. Then go back to M1 0w-40, or, try Rotella T6 5w-40 or a Amsoil HDEO or HDD, etc. Wow.
Pablo can hook you up.
AMSoil HDD is a stout 30, is very shear resistant, and may stay in grade. It's not dexos certified, though.
GC is also a heavy 30, but is not as shear resistant as HDD. But it starts out thick enough that maybe it will stay a 30. It's also not dexos certified.
Maybe a dexos-certified 10w30 that starts out at the high end of the 30 range?
EDIT: Never mind that. There are no dexos-approved 10w30's.