[cashflyer]

First, my disclaimer: I am an Amsoil dealer and I use Amsoil products. Now, some info - take it with that grain of salt.

I think if you go to the oil company websites, you can request MSDS sheets from them for the products they sell. You may be able to check the zinc levels that way.

I use the AMSOIL Series 2000 Synthetic 20W-50 Racing Oil in my SC. It has 1675 ppm of "zinc, including zinc compounds".

Keep in mind that any oil which displays an API approval had to use the API approved additive package. Exceeding their approved levels of zinc and phosphorus compounds is not allowed. Certain Amsoil products are API approved. Others, like the racing oils, are not.


The Mobil website says, "All engine oils have an additive called ZDDP (Zinc DialkylDithioPhosphate) for wear protection. In general, heavy duty engine oils (truck oils like Mobil Delvac) have a higher level of ZDDP. Automotive engine oils generally have a lower level of ZDDP to protect catalytic systems."

The Spectro oil site says, "High levels of this additive are unnecessary for racing use. You see, these additives are proven to work with the same effectiveness regardless of the amount present in the oil! (so long as there is at least some ZDDP present at all times) Where the benefits of high doses of ZDDP are actually realized is in long-term and long distance use, ensuring that the oil never runs out of this critical additive."