I was looking over several Lube Recipes on the net, and noticed that some of them call for STP Oil Treatment. Why? What does STP Oil Treatment add to the mix in the minute amount that it is added to the lube?
From my experience in using STP Oil Treatment and other oil additives on older small engines ... all it does is thicken the oil and add Zinc to the oil to thicken it up. I've also seen a lot of older small engines that have developed a Zinc film on the pan because of the overuse of oil treatment 'snake oils'.
So, can someone tell me what the logic is behind using the STP oil treatment in bullet lube?