Ok, here's some interesting results. It is now evident that quick silver and mercury stern drive oils are different in make up. Here are the virgin samples of each.
Well, there you have it.code:
Quick Silver Mercury
Mo 33 60
Phos 1181 516
Zinc 17 14
Mag 0 1
Calc 31 55
Si 36 0
Visc Cst 15.10 14.51
SAE 90 90