To answer some of the questions posted....
ZDDPlus is available from most of the vendors that advertise on this forum Gbodyparts, myself, Nick Micale, TA Performance, Jack Cotton to name a few.
This product has been brought about by Richard Clark who for those not aware of it, owns without any doubt the largest turbo regal collection of parts and cars. (I have first hand knowledge of this since he has been a buyer from us for many years.
This is the same product that is sold by several major mail order companies eastwood, isky, crower, erson, moss motors, year one etc....several major studebaker companies, old ford companies etc...we also sell to honest charley speed shop (one of the oldest in the country)
While oil companies may claim they have zddp or the big long technical wording...that is not the major concern as a owner of a performance flat tappet engine should be concerned with...what you want to know is how many ppm of zddp is in the oil....when our cars were new under SF category it was 1,800 ppm....Brad Penn does not have that much...
You also have to keep in mind, that zddp depletes at a faster rate for the first 1,000 miles you drive.....so its best to start off with 1,800 ppm over say 1,400 or 1,200 ppm....of zddp.
Companies may say they have zinc, but it has to be the molecule zddp...
It really is quite simple....buy any oil you been using and favor....add one bottle of zddp which wil ltreat a 4-6 quart capacity back to 1,800 ppm....every oil change....
the more performance your engine cranks, the higher the extreme pressure points and risk you are taking if you do not add zddp....wear translates into metal shavings...which can be costly to fix when it occurs.
Also zddpaste for cam assembly we have proof it is superior even to Joe Gibbs assembly paste.
Crower uses the same paste.
As a turbo Buick owner, you are in a unusual position being that the company behind it has nothing to hide, and in fact has a real passion for the same cars as you and I.
It is very tough to get the product in retail stores. With the new SN oil coming and now they want to up the ethanol to 15% instead of 10% its a wonder any of the older cars will be able to digest the new stuff and survive.
From a logical stand point at $10 a bottle its cheap insurance. Its tough enough overcoming all the other issues with these motors and parts without adding to the problems of premature wear on the cam and lifters.
denniskirban@yahoo.com