Which viscosity this OCI?

[lukejo]

6.0 Chevy. Calls for 5w-30. I always use full synthetic. I've always used 5w-30 and do not have any consumption or leaks at 95k miles.
I tow in summer, but never in winter. The upcoming OCI will run from end of November to April. Sits outside in wide-open wind area in Illinois winter. Any type of heater is not an option.
Q—should I use an 0w-30 for this OCI? It always starts, and the temp never exceeds 5w rating, but would 0w only provide potential benefits with zero negatives?

 

[JayhawkRoy]

At 95K, I would continue to use the oil that gave me no oil consumption between OCI. If you want to be adventurous, try the 0W30. I can see some winter benefits and not a lot of negatives. New oil consumption might be one.

 

[Rolla07]

0w30 will work fine. Highly doubt you will see any negatives.

 

[PimTac]

I would stick with the 5w30. Easy to find and the difference between 5w and 0w is tiny. Stick with what has worked so far.

 

[dave1251]

5W30. I doubt you will see very many -40F starts.

 

[Triple_Se7en]

Originally Posted by lukejo
6.0 Chevy. Calls for 5w-30. I always use full synthetic. I've always used 5w-30 and do not have any consumption or leaks at 95k miles.


Never try to fix something that's not even giving you a clue it might need even the tiniest repair. Stay with what's working very good.