jimmyraythomason
Member
In the '70s I overhauled cylinder heads for diesel engines at the Caterpillar dealership in Birmingham. Since some of the heads may hang on the rack for up to a year,the valve stems had to be lubed with something that would not run off leaving the valve stem to prematurely wear out. In those days,30 weight was THE oil for a diesel engine but would not stay to protect the valves. The solution was a 50/50 mix of 30w oil and STP oil treatment. I haven't used this on guns as it is fairly thick but on a weapon put away for long term storage it might be just the ticket.