[QUOTE=KDADDY79]Hey Gunslinger,
I was under the impression that the STP with the red lable was for "high mileage" vehicles. The reason I avoided it was I was afraid it might soften up the new valve guide seals too much in my motor. I just did them two years ago.
I currently use Lucas brand oil stabilizer for the ZDDP.
Any feedback is much appreciated!
Kevin
[/QUOTE]
The red label is for 4-cylinder engines. The transparent container STP is for high mileage, smoke treatment, and the black container is for engines leaking oil. Even the blue label STP is supposed to have sufficient ZDDP, the red label is supposed to have double that amount. That seems to make a difference to some...that's all I'm saying and giving people an option.
There's a number of additives that have ZDDP...STP is just one of them.