It seems that the long term trend is for diesel oils like Rotella is less and less ZDDP. So switching to an oil formulated for tappet cars seems like a logical plan. Amsoil’s Z-Rod is one. I think Mobile 1 also still has ZDDP. There are others. To open up a can of worms, there is also the argument that using racing oil that has ZDDP in it in a street / collector car is also not a good idea. http://www.cam-shield.com/acatalog/diesel.html has the argument. (Of course note this link is from an additive manufacturer.) Gary H. > -------Original Message------- > > I don't ad zinc additives because I really don't know how much to add. I use > Amsol. ... > On Mon, 15 Dec 2014 15:38:08 +0000 > "Hall, Ricky L" > > What brands zinc & phosphorous (ZDDP) additives are you guys using > >at every oil change, if any? > >latest CJ-4 rated Rotella T does still have 1,200+ ppm ZDDP. -- -- -- Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html. -- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. http://groups.google.com/group/1962to1965mopars?hl=en. --- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to 1962to1965mopars+unsubscribe@xxxxxxxxxxxxxxxxx For more options, visit https://groups.google.com/d/optout.