I don't know if it is a rumor, but I heard the GM is going to go back to selling EOS (or the same thing under a new name).

The STP red has 3932 ppm of zinc, the blue 2436 per a study I recently saw.

If you look around, you can find the old formula of diesel oil. I found some Castrol Diesel in the old formula today at a NAPA store. I bought some it it.