Are any of you using fuel additive?!
My 991.1 has the direct injected non turbo 9A1 engine.
I'm my older cars I have used " Marvel Mystery Oil " in the gas. It's a awful name for a good product. I like the way it can add upper cylinder lubricant.
However, I have never used it in a modern gas engine and would like to her what you think about. Or any other fuel additive for that matter.
Thanks!
