With the additions of the new catalyst installs on all Diesel engines, the added ZDDP is quickly becoming the modern day leaded gas. It makes these catalysts less effective by causing glazing of the catalytic materials.
That being said, just because Rotella and Delo used to have a good dose of ZDDP, does not necessarily mean it still does. Mainly because it does not.
What is recommended for ZDDP content?
Thanks,
Joe
Joe, from everything I have read and have been told by the "experts" a 1,200 PPM ZDDP content is used as a baseline, many high quality zinc fortified racing specific engine oils contain 1,800 PPM It is my humble opinion that any more is a waste and should not be used. The phosphorous content is what drives the ability to keep the zinc contents reasonable.
Lower phosphorous, lower zinc.
Jet Fever, I doubt seriously I will get a response to the e-mail I sent to Amsoil tech. about the additive testing, but am trying to find out.
My suspicion is that it was a "Pay to participate test" whereas advertizing is provided after the results are finalized. Amsoil will not under any circumstances be involved in those types of studies.
GT
