I know this has been discussed before, but just wondering in a 5w30 comparison which would be the best HM oil to use. For example, I have a chevy 4.3L (prone to manifold/seal/oil cooler hose leaks) which sees high idle time and will be driven in Chicago based humid summer comming up. I'm debating on taking by stash of Maxlife back in exchange for the Pennzoil I bought today which is $2.50 cheaper per 5QT jug with coupon, but don't wanna shortchange the Vortec. The only huge difference I see is that the Maxlife has a better Flash point. I do have a K&N cone filter with a prewrap on the intake as well as a custom Wait4Me computer tune & run 93 Octane. Your thoughts?
Pennzoil Maxlife Blend Castrol Mobil Clean 5000
40*C cst 74.1 67 n/a 62.5
100*C cst 11.7 11.5 12.0 10.6
Visc Index 157 163 n/a 160
Pour Point -33* -42* n/a -39*
Flash Point >196* 221* n/a 200*
Noack Vol% 14.2 a n/a
Pennzoil Maxlife Blend Castrol Mobil Clean 5000
40*C cst 74.1 67 n/a 62.5
100*C cst 11.7 11.5 12.0 10.6
Visc Index 157 163 n/a 160
Pour Point -33* -42* n/a -39*
Flash Point >196* 221* n/a 200*
Noack Vol% 14.2 a n/a