OK I’m not going to say this again. Every independent lab that has tested additives has shown that- not one will increase HP, mileage and engine longevity.
Every oil manufacturer has emphasized not to add anything to their oil.
And here is the kicker. If new car manufacturers could squeeze another ½ mile per gallon on that sticker they put on the window. You know they would be using and recommending it.
You want to make a pile of money? Produce an auto additive, give it a fancy name and make outrageous claims.
Oh yeah, STP, the worse offender. It’s only good for putting on your bearings for a rebuild. Although STP is suppose to be a secret process. I believe it to be nothing more that Hydrogenated petroleum oil, like Crisco and margarine. High heat, add a nickel catalyst and bingo- Cross-linked hydrocarbons.
The only oil that time and time aging has shown superiority in the fields of resistance to breakdown from extreme heat is Synthetic oil. -Think turbo’s. But for VW (and Harley’s) it just loves to weep out of every crevice.
A couple of years ago I read that Castrol was the one brand that resisted viscosity break down at higher temperatures better than any brand except synthetics, this was substantiated by two different independent test labs. The reports appeared (years apart) in both a motorcycle and one of the consumer magazines.
And about the oil manufactures cutting back on putting less zinc in motor oil –That’s true and that’s not very good us VW guys with flat head lifters. But there are two things you can do to. One is to use 10-40 and not 10-30. 10-40 has more zinc. Also using oil for diesels. That has all the additives and it has good slug of zinc in it. If I can find the article I’ll bring it to the meeting.
Jct :icon_study: