ok, I am full of questions, but they are relevant, so help me if you can. The dealer (a friend of the family) that i got my Z from, said that he put a pint of this STP oil treatment stuff in to help. This stp is like HONEY! I have heard it is ok, and also heard it is horrible! should i flush the system asap or not worry about it? ok, thanks

 

I use it in my motors after they have a coupla hundred-thousand miles on them. I have never had any stp related failures. For all I know, it has helped my motors last well into 300k mile range.

 

It's one of those debates that may go on foreveer. I've used some oil treatments and fuel treatments in my Z and never had any problems.