Can't find my old post. anyhoo. Basically I ran dyno juice 10w40 to flush my engine after a gasket change and it was quiet as can be. Put the amsoil 5w30 synthetic in the piston slap was back. So after a post here I decided to run a little thicker to try to get rid of the engine noise, mostly the piston slap. SO I buy and put in amsoil 10w30, same noises are present, maybe more. I just dont understand the deal. I would have thought synthetic would be a better oil. The engine it quiet when it warms. However piston slap it present until the engine reaches 130F aprox. There was no slap with shell 10w40 dyno juice. I am lost.
If I have to go back to dyno, can anyone recommend an oil that would have close to the antiwear and other properties such as the synthetic has. Anyone have any expert advice for my situation?
Car is a 1999 Olds cutlass with the 3100 V6, 52K miles.
If I have to go back to dyno, can anyone recommend an oil that would have close to the antiwear and other properties such as the synthetic has. Anyone have any expert advice for my situation?
Car is a 1999 Olds cutlass with the 3100 V6, 52K miles.