Melvin

[Melulloa]

I have a 2007 tahoe and use 5w-30 oil. Im running around 172047 miles on it and would like to keep it riding smooth. I have no error codes. I was recommended to use 5w-40 oil to give it better life and performance. What would you recommend?

[Jsdirt]

For what it's worth, I had the same vehicle, only a Silverado (same exact platform). At 75k or so, my oil analysis was showing higher than average wear metal content, from pistons, rings, and camshaft presumably. I went from Amsoil Signature Series 5w-30 to the same oil in a 10w-30, and wear metals DRAMATICALLY decreased. I only did 2 more samples after that, but everything was good.

 

I sold the truck at 134,5xx miles, still running strong. I had been using a Range AFM disabler since 75k, so that was a big factor, too- I would recommend getting one if that engine hasn't been deleted. I'd wager it was rebuilt not too long ago for lifter failure. I have yet to see one make it to 170k on the stock AFM lifters.

Edited November 25, 2023 by Jsdirt