Marvel Mystery Oil?

[Bill Greenwood]

The Camguard guys talk some interesting stuff. But as far as being "tested and verified by science" I have never seen any reports of any large scale unbiased factual testing like I described above. Nothing more than they tried it in an few engines and it seemed to work ok.
Marty if you have results of any such real testing, how about posting it here for us to see.

Aviation Consumer likes Camguard, but again no big test results. It is expensive stuff. Marvel is fairly cheap and has been used for so many decades by so many operators that it probably doesn't harm an engine and may well do some good especially in the big radials.
The main engine overhaulers that I spoke to didn't seem to be even aware of camguard. My overhauler did suggest that I use it in my Cont TSIO 520-UB to combat valve stem wear.