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gregz

wrote:
On Sun, 16 Jun 2019 05:58:37 -0700 (PDT), wrote:

My mechanic likes to use Castrol extended and change oil every 5000
miles. I have alway s used Pennzoil 10/30 and changed oil every 3000
miles. which one is right? Or both of us right? Whaddaya think guys?

I think you are wasting oil.
3000 miles is far too frequent.
When was the last time you heard about an oil related engine failure,
even with people who run the same oil for a couple of years?

I switched to synthetic in truck and now sounds better. Lifter collapse and
plugged valve oil screen common on my Chevy truck. I also stay in 8
cylinder mode, and 4 cylinder mode eats oil.

Greg