Re: Lubrication interval
... and be careful NOT to use Mil-spec Aeroshell (designated with the letter "M"). It has a slight modification in the recipe.
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Subject: Re: [ap-gto] Lubrication interval
There have been a few threads on this in the past.
Search for secret sauce and for Aeroshell
The former is an A-P product, the latter is a Shell product
I beleive the suggested interval is one to 2 years, but defer to A-P.