I am working on a 1995 Kawasaki Ninja that sat for 15+ years with fuel and oil in it. I intend to use Sea Foam Motor Treatment in the tank to reduce some of the varnish issues but I also wanted to add Sea Foam to the crankcase before draining and changing the oil. The crankcase oil is low enough that I can’t see it in the level window so I have no idea how much oil is actually in the crankcase. How much Sea Foam can I safely add to the crankcase? Also, I’d like to let the Sea Foam sit in the crankcase for weeks if not a month or more before draining it; will leaving it in the crankcase this long be a problem?