The service book says to use either 5/30 or 10/30. Chevrolet dealer has sold me 10/40 saying thats Ok for this engine.
Coments appreciated if it makes any real difference?
Thank you
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My local motor factor's oil supplier says 5w-30 www.commaoil.com/.
There's probably not a lot of difference as long as you make sure it meets the spec in your handbook.
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