I guess that would be dependent upon how many bottles were in a case?
If there's 12 to a case, that's a good deal, and if there are 10 to a case, that's 10 a bottle and not much savings there. Just my opinion.
Why not buy an oil that already has it like Redline or Amsoil? Many cheap off the shelf oils have tons of ZDDP too. The Amsoil that I run has in the neighborhood of 1,400ppm.
i have been running rotella and stp oil treatment from breakin till now with no problems and no noise from valvetrain. stp says zinc right on the bottle
my engine is 3 years old now and i am wondering if the cam is going bad. i have a comp cam 260h cam this year i did put the zddp that kirbans sells. my butt says the engine feels the same as when i built it .
ive always put mobil1 10w30 and a pf47 filter every 2,000 miles. have 100 miles this year so far, total i have about 15,000 miles in the 3 years.
I just bought some from Pete (Phoff) fellow board member. He gave me a good price and is a good guy to deal with. Here's a link to him, not sure if he has any left, just e-mail him.