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So I hate to hijack this thread but has anyone here ever tested the STP oil treatment for its ZDDP content? It says on the bottle that it contains it and somebody online had emailed them about it and they simply said that "adding 16oz of the STP to 4-5qts modern oil will restore to the ZDDP content to what is was in years past" (paraphrasing).

Has anyone tested this or had any long term experience with this? I am running this as my ZDDP additive in my Charger (street car) and so far, so good. Cam still looks fine after couple hundred miles + break-in.

I would be interested if this is a viable alternative as STP is like $2 a bottle as opposed to $10-15 for the pricier stuff or $10+/qt for the already made quarts. I have no problem shelling out the money for these pricier options if they are needed for a street car. I am not winding my engine past 5000 RPM for any amount of time or really laying on it like a race motor.

Just curious...

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Yes there is a Blackstone or Staveley test floating around somewhere. STP RED came in at JUST under 3000PPM (it was 29xx) and BLUE was about 2000. That means its only good for a SLIGHT bump (about 100PPM) in a crankcase. Do the math. ZDDPlus tested at 71,200ppm (keep in mind its only a 4oz bottle)
I am currently using "Rislone engine oil suppliment with zinc" which supposedly has 15,600ppm and comes in a 11 ounce bottle, available at Oreilly's for $8.50.

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