ok i found what we are looking for, i found it under a thread for break in of flat tappet cams and stp is now adding zddp to its thickener, i guess the court case did some good but you do not want that stuff in your engine. the comparison of products can be found at
ZDDPlus™ - ZDDP Additive for Classic Cars - Agricultural Equipment & More. crane cams break in lube and zddpplus+ are the highest and 10x higher than stp down further in the thread it stated the crane is in a 50w base. stp will be about 200w
The use of STP in engine lube oil, for many, falls into the same class as using Toilet Paper (TP) for bypass oil filtration ("TP belongs in the BATHROOM! HAR HAR!"), and other similar practices or devices used to enhance engine performance or longevity. In these cases, no amount of supporting proof, testing or logic will change the mind of the doubter - so the best approach is simply stating facts as best and accurately as possible, and let the readers decide for themselves.
As far as STP is concerned, I've used the stuff for various uses and in various applications since the 50's - and the use of Zinc as a primary beneficial ingredient is hardly a "recent" addition - but rather, a main ingredient for many, if not ALL those years.
Personally, *I* find it sorta humorous that a big oil chemist can dip out a specific amount of Zinc material, add it to that company's engine lube, and SHAZAM, it's a sacred and magical formula that is THE PERFECT blend for use in our engines - and one that end users DARE NOT trifle with, lest they inevitably screw up the "magic" of the original, and their engines instantly begin self-destruction!
AND yet, all at once, under EPA dictate, these SAME oil company Wizards will REMOVE the Zinc that was earlier included as one of the major wear reducing compounds - and that oil is STILL deemed as the wonderful and perfect result of engineering genius - and IF some customer succumbs to the temptation to buy and add BACK the same Zinc compounds formerly used in that oil - he will be attacked and ridiculed as a victim and user of "Snake Oil" advertising and usage!
:-laf
YUP - STP in their original formulation, use a high-viscosity carrier for the Zinc friction reducing portion of the formula as used in older and more worn engines - and in later years, added a lower viscosity version for newer engines - but the Zinc portion of the additive, just as offered in many major oil company engine lubes, is still in there, and still offers the same potential reduced friction and protection!
As I stated earlier in this thread, I've used STP since the 50's, always figured it provided helpful benefits, based upon other uses where it clearly outperformed other conventional lubricants - especially in critical and wear-prone areas in newspaper presses I was responsible for thru the years. Eventually, after becoming one of the diesel engine faithful, and using engine oil analysis, I could actually SEE evidence of the beneficial effects of both the STP and that nasty 'ol Frantz TP bypass filtration:
#ad
The above sample was 5000 mile on the oil, 113,000 miles on the engine, STP and a Frantz TP bypass filter - and obviously as displayed by the wear and contaminant numbers, SOMETHING I was using was working, because to this point in time, I have never had any better reports, or SEEN better ones posted by other users of any oil brands or filtration methods - and while Blackstone Labs always commented on the slighly elevated viscosity readings, they ALSO commented that that elevation obviously was having NO adverse effects upon engine wear!
Don't believe it? Don't like it?
FINE - then don't use it! :-laf
BUT, until you can provide a BETTER result, using the stuff YOU prefer and recommend - I'd be sorta cautious about knocking or ridiculing what competing or substituted products can be shown to provide...
Attention: TDR Forum Junkies 
