D dhall57 New member Joined May 2, 2010 Messages 5 Reaction score 0 Points 0 Age 68 Aug 28, 2010 #1 What's your opinion on Marvel mystery oil? Should I add it to my oil and fuel. I have a 90 Silverado with 92000 miles. Is it a good product or just a waste of money?
What's your opinion on Marvel mystery oil? Should I add it to my oil and fuel. I have a 90 Silverado with 92000 miles. Is it a good product or just a waste of money?
