I went in for my 3rd oil change today, when I got my car back the service rep told me they put in Zmax in my car free of charge. I was told apparently it increases engine performance, I didn't think much of it and drove off.
Later on in the day as I was leaving from work I got an engine light, I don't know if there is any correlation between Zmax and the light but I will be taking it back in tomorrow for a checkup,
Anyone heard of anything about Zmax?
