I just purchased a oil additive recently, something called "ZMAX".
I have no idea is it really bad for engine? i did some research online
and most of peole don't trust it.
but...so it is kinda little confused me, cuz when I add zmax product to my
02 wrx, obviously I feel the engine is smooth and rev. more quicky then before
when I downshift i can feel it into other gear and the rpm went up smooth more quite, when I accelera from 1st gear, it just feel the less friction...the other thing
I want to proof is that about the mileage, I will know after i use other full gas tank
I just wonder does anyone else use it and really feel it work~~
cuz if there are more negative, i think I will just stop to use it for next term.~

 

nah, it's all about good oil from the start, redline synthetic ftmfw!