Thats good to know.Up here north of the border not sold here.The Rotella-T is available at Walmart in 20 litre jugs which is good for about 3 oil changes.Thats what I am using which is why I am asking about the Zddp.

  

There is an article by Joseph Pullen in the latest issue of YBM where he indicates you can use Amsoil 10W-40 in our Y-Blocks because they have zinc. He is correct. I use the Amsoil 10W-40 "Premium Protection Motor Oil" in my '56 Customline. The product is listed as having "a high zinc formula and excellent for flat tappets, high performance, heavy duty and high milage applications"

Rono

  Ron Lane,  Meridian, ID

Mark,



As far as I know, it still has not been proven/settled whether the aftermarket ZDDP additives will even mix properly. I'd stay with an official/proven oil formulation just to be safe.

While the newer Rotella does have less zinc (I still have a dozen gals. of the older formula put away), it may still be adequate for tappets/cams that are well broken-in, but might possibly be dicey for a fresh motor with stiffer/HiPo springs. Also, since the higher detergency of diesel oil may eventually strip off some of the built up protective zinc layers laid down before ZDDP was reduced, you might consider (like me) rotating occasionally with a ultra high-zinc racing oil to replenish protection.

6 VOLTS/POS. GRD. NW INDIANA

Looking around the internet there seems to be confusion about how much Zddp is this oil.Does it still have sufficient additives for our motors or should I be buying the Zddp additive in cans?Also seems to be a question as to what is the correct PPM for gas motors as opposed to diesel.Apparently too much is just as bad as too little.