Hello, everyone. Ive read on this site that some people are having good experiences switching to a thinner oil (sometimes even thinner than what the manufacturer specifies). My manual recommends either 5w-30 or 10w-30, ambient temperature being the factor. Ive used both grades, but my engine is still quite noisy. Granted, the engine has quite a few miles on it, and ive heard rumors of older GM 4-cylinder's being quite noisy to begin with. I've used synthetic Castrol 5w-30, and synthetic Valvoline 5w-30... no difference. I recently gave some 10w-30 Chevron DINO oil a try, with no results. In fact, it seems that my engine actually got louder with the thicker oil. So has anyone run 5w-20 in an engine like mine? Id really like to give it a try
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