Chevrolet Forum - Chevy Enthusiasts Forums - Heavier oil for high mileage engine?

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crawdad

January 13th, 2019 1:24 PM

Heavier oil for high mileage engine?

2003 Impala 3.4L 286K garaged in GA
Should I switch from the recommended 5w-30 to 10w-30 or 10w-40? I was thinking the the engine has certainly worn a bit and the clearances have increased. Don't know the oil pressure yet.
Thanks.

kevinkpk

January 13th, 2019 1:43 PM

Personally, I'd go with the same viscosity, high mileage oil.

crawdad

January 13th, 2019 4:28 PM

That's probably a better idea. Thanks

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