Just about every month I get several questions concerning the difference between aviation and automotive engine oils. This month I received a question about using Aeroshell 2F in a vintage automobile and the ever popular question about why one should not use automotive or heavy duty engine oil in their aircraft engine.
The answers always go back to the chemistry of the oils. Automotive and heavy duty oils all contain ash or metallic additives and aviation piston engine oils are all ash less. [Read more…]