Originally Posted By: geeman789
Thicker oil should be the FIRST thing to try... cheap, harmless experimentation that MIGHT reduce oil consumption a little, or a lot...
And, no it won't hurt your engine... really. Regardless of what SOME people believe...!
Of course a thicker oil won't hurt his engine. I was talking about giving GM ammunition, not about ruining motors. 20w-50 will work just fine. But, considering he may have a major "debate" with his dealer over this yet, it would be wise to follow the manual. When GM wants dealers to monitor consumption on a problematic vehicle, it would only make sense to not be jumping from brand to brand and grade to grade. On the other hand, if he doesn't want GM's help, he can run whatever the heck he wants.