Quote:
Originally Posted by Tom Vaught
I was told by a Oil Engineer some years ago that the STP ZINC PPM was around 1400.
1400 ppm is a nice safe number for flat tappet camshaft durability.
EOS and STP Mix has been used for years on Camshaft Break-in so NUNZI speak TRUTH Kemosabe.
Tom V.
Some of the older 15W40 oils (used in Farm Tractors) had zinc numbers that high in their oil. I bought gallons of the 15w40 oil before they discontinued it and put it on the shelf.
|
I asked a friend of mine this question yesterday. he worked in the research and development lab for S.T.P. when it was owned by First Brands. he told me that the amount of zinc in the oil treatment would not be enough to compensate for oil without it. the oil treatment has some good stuff in it but really is just a "thickener" to raise the viscosity. it won't hurt to add it. best thing to do is to buy oils that have already the right viscosity and have the proper additives blended into it. some oils are already "saturated" with additives so adding anything won't help.