[F ROCK]

Any horror stories about STP oil filters?
I've been using them for fifteen years or so without any issues.
I've got a NAPA nearby, i could get their filters just as easily; but I usually just go to autozone, and get whatever oil is on sale and the stp filter. (Because it's that, or a FRAM filter. They dont have any others that i'm aware.)

So far i've only read good things about their filters. Nothing special but no horror stories.
However... Their oil treatment claimed to be a "ZDDP Supplement"; but Project Farm guy sent STP lube to a lab and found that it contained less zddp than a quart of cheap motor oil. When I was a kid it was advertised as "The racers edge" with Richard Petty.

I knew an old schoolbus mechanic. (my mom drove a crappy old school bus; as a kid I spent lots of time at that garage.)
He always put a small bottle of STP in the manual transmissions.
I put a bottle in my muncie, in his honor lol.
Some folks say it shifts smoother? I dont know. Mine always shifted smooth.
Thoughts on STP?