RE: After-run oil question
Dr. Nitro, I did a little digging to find out more about Castrol Syntec and found this at the Amsoil web site:
"Recently, Mobil accused Castrol of reformulating its synthetic by substituting other basestocks in place of its synthetic polyaphaolefins (PAO's). Castrol Syntec is a hydrocracked oil. That's right, Castrol has replaced the PAO synthetic base stock with hydroisomerized petroleum base stock"
If true, this doesn't sound like an oil I'd use in my YS.
Edited to add: A little more digging turned up the fact that the German made Syntec might be a different formula. The MSDS on Castrol Syntec 0W30 lables it a "synthetic hydrocarbon".