I remember Slick 50. I used to work at a mower shop that sold Slick50. We did and unscientific test using Slick 50 and regular motor oil. I don't remember the details but we ended up running the engines until they seized and Slick 50 was the definite looser.
We used to use and sell Lucas Racing oil. Never had an issue with it until we learned that the bearings in roller lifters and rocker arms along with roller cam bearings require a certain amount of Zinc to live a full life. I had a conversation with a Lucas engineer and he said their racing oil required a Zinc additive to make the roller bearings happy. During the conversation Valvoline ZR-1 was mentioned. Not only did the ZR-1 have enough Zinc the Lucas engineer stated the VR-1 was an excellent oil and their racing oil required an additive to be considered comparable.
Another concern is what formula was good yesterday may not be good today and rumors make it impossible to know what has changed. I heard a second hand story that convinced me STP did something positive. The problem is the story is forty plus years old. I doubt the same STP formula exists today.
Remember when folks were paying up big dollars for GM posi lube because the original formula contained Whale oil and was the only stuff that worked well. I sold all I had and my posi unit has never chattered once using an alternative additive.
I enjoy reading folks opinions and value the source that helped form the opinion. Keep doing whatever is working for you. It can't be that far wrong if you're happy with it.
Years ago a buddy was sponsored by Prolong. I figured he might have an "in" as to whether that additive did anything worthwhile. I asked him several times and always received the same answer... "I'll give you a bottle they gave me a whole bunch of the stuff".
Btw ..... Who makes the best car stereo, Pioneer, Marantz, Kenwood etc.
