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.
