Top positive review
One person found this helpful
Zmax gave a remarkable performance improvement to my old car
on August 19, 2010
I have an old car. 1986 vintage Nissan 300zx.. In an attempt to help it through an incredibly hot Texas summer I decided to add Zmax. When I added the additive to my crankcase my engine began to start easier. When I added the additive to my fuel. It started so quickly that it startled me. I appear to have better acceleration and performance throughout the power range. I am going to use it again at the manufacturers suggested interval through this car's lifetime and any vehicles that might follow.