My 98 Passat had about 92000 miles on it when I put in Zmax. After 1900 miles it had striped out the carbon which all fell to the oil pan, clogging the oil screen
and causing the oil light to come on. Oil pressure was
below 5 psi. It cost me about $470 to have the oil pan removed and cleaned out. The Zmax warranty company denied my claim. I am now ooking for a class
action law suit to join.