Well, I like the lucas stuff. seems to do the trick for me. It doesn't really thicken the oil, just seems to make it hold on better, less run off.
STP and the lucas stuff is alot different, at least in what they do.
The lucas is really thick when pouring (squeezing) out of the bottle...it's 100% petrolium based but is "gel" like. Interesting stuff. I just thought I'd give it a try ($6.00) and I'm glad I did.
Steve
As far as additives being gimmicks, I don't think all of them are. I've tried different products over the years and some have worked, some have not. As far as needing scientific proof...I don't always buy into science...kinda like engineers, It all makes sence on paper but the real world is what I believe in.
I don't think the lucas product is necessary, but I do think it helps.
Either way, thanks for all the input.