Plenty of it in the states at a place called big lots, I just had some analized but it came back kinda low, it actually should be around 3900ppm zinc for the Red STP 4cly oil treatment. I did not mix up the sample and took the oil from the top so I think it settle out since it has been sitting in a warehouse for about 8 years. But it's still perfectly fine, I'm going to get anouther sample run. It should be adding around 400ppm zinc and phos to 5 quarts of oils. The STP oil treatment in the blue bottle has half as much as the red due to EPA rules on ZDDP content and it's also much thicker.

STP - Bob Is The Oil Guy

I use it in my cars to boost up my oil, and get a little bump in fuel economy with it. I only use a additive is I know exactly what is in it. I posted in the oil filter thread about where to do engine oil testing. Maybe someone can get the stuff tested to see if it's worth the money. It's pretty much why I have not said anything good nor bad about it. Have no ideal what's in it.