Marvel Mystery Oil

[John Sabato]

As I recall, if you got STP mixed with engine oil it became super slippery... in fact if you got it on your hands, it was so slippery that you couldn't pick up tools like a screwdriver or pliers... they just slipped right out of your hands. In the advertisements, it was recommended by race car drivers to make your engine run FAST as the slippery properties were supposed to reduce engine friction... but the pro race car drivers didn't bother to mention that the engines they used it in for racing were torn down and cleaned every week... so it had no chance to be harmful to your engine.

I think I also recall that it was reported that using it would eventually cause a lot of sludge to form in your engine... I stopped using it in cars around 1980..., but it does make good case lube.

I never used Marvel Mystery Oil for anything... Quaker State oil is the worst motor oil I have ever used... lots of sludge between oil changes. Pennzoil on the other hand, has always worked well for me... stays clean a long time. I still insist on it when I have someone else change the oil in my vehicles.