OCI will continue to be 8k (~2 months) under severe service conditions (high rpm w/lots of engine braking, dusty conditions, extended idling, etc.).
Have a choice between M1 0w30, M1 5w30 HM, M1 10w30 HM, and M1 0w40 from the "black friday" stash. Will probably try the 0w30 this time around due to the relatively cooler (but not freezing) temps...save the thicker stuff for the summer, when it becomes "ridiculous service" conditions.
Chrysler (or is it CAFE?) calls for a 5w20 in this engine (310hp '08 4.7L SOHC), and though the 20wt oils have worked well thus far, the engine really seems to like a slightly thicker oil. Motor currently has 115k miles and runs like a top with zero oil consumption...has only run the below-listed oils since factory fill.
How I'd rate what I've used so far, in this application:
1. Mobil 1 0w40
2. German Castrol 0w30
3. Pennzoil Ultra 5w20
4. Mobil 1 0w20
5. Pennzoil Platinum 5w20
All of these oils seem to have had no problem lasting 7500+ miles under "severe service", except for PP 5w20, which had to be changed at 6k because the motor became very noisy. Ranking is purely subjective, based on how the motor ran & sounded with these oils...
Have a choice between M1 0w30, M1 5w30 HM, M1 10w30 HM, and M1 0w40 from the "black friday" stash. Will probably try the 0w30 this time around due to the relatively cooler (but not freezing) temps...save the thicker stuff for the summer, when it becomes "ridiculous service" conditions.
Chrysler (or is it CAFE?) calls for a 5w20 in this engine (310hp '08 4.7L SOHC), and though the 20wt oils have worked well thus far, the engine really seems to like a slightly thicker oil. Motor currently has 115k miles and runs like a top with zero oil consumption...has only run the below-listed oils since factory fill.
How I'd rate what I've used so far, in this application:
1. Mobil 1 0w40
2. German Castrol 0w30
3. Pennzoil Ultra 5w20
4. Mobil 1 0w20
5. Pennzoil Platinum 5w20
All of these oils seem to have had no problem lasting 7500+ miles under "severe service", except for PP 5w20, which had to be changed at 6k because the motor became very noisy. Ranking is purely subjective, based on how the motor ran & sounded with these oils...