I started cleaning out my oil and chemical cabinet. I found about 20 bottles of the Gunk brand lead substitute that I accumulated probably in the 90's or early 2000's. I was putting it in my lawn tractor back then and probably a few tractors. Havent used any in years. Do you guys use it? I find many pro and con debates on the net. I haven't put any hardened valve seats in my tractors YET but if and when I do another overhaul I will. I most likely will send it to the local auction unless I'm persuaded to use it. I also found other obsolete lubes like straight Dexron atf and Dexcool which I will be getting rid of.