I have a few quarts of straight mineral left over from my engine break in period. Can I add a quart of straight mineral oil to 7 quarts of Aero Shell 100+ at the next oil change? Both oils are SAE 50.
I've seen this comment made previously in other VAF threads and I feel the need to comment.
Aeroshell 100+ contains Lycoming LW16702 additive. This is not Camguard, but is Lycoming's recommended anti scuff/ anti wear additive. Camguard is an aftermarket oil additive, and is NOT advertised to meet the requirements of LW16702 or recommended by Lycoming.
Also, here is an interesting post regarding an experiment by Dan Horton to test the anti-corrosion properties of Camguard: