I second what Jeff says.  I would never use it alone.  But every time I have stopped believing in the 'Mystery'  I have ended up with a side seal stuck in a bunch of 2-stroke residue.

I recommend 1 oz per gallon of 2-stroke oil, with another 1/3 oz of MMO.  If I am flying cross country, which means I am running lean of peak, I increase that amount of the mixture a little.  I end up having to drain my sump oil frequently, which means frequent oil changes because the 2-stroke oil has started to dilute the Mobil 1 in the sump.

Perhaps if i started using synthetic 2-stroke oil (like Lynn suggests) I wouldnt have to worry about dilution.  Then again, that royal purple stuff is very dearly priced.

Dave Leonard  

On Mon, May 13, 2019, 5:37 AM Jeff Whaley jwhaley@datacast.com <flyrotary@lancaironline.net> wrote:

Marvel Mystery oil is just that a "mystery" but don't mistake it for oil - it is a cleaning agent.  No scientific proof but I'm pretty sure it is basically Varsol (90%) masked by coloring and a perfume to disguise its true identity.  You can add a little to your gasoline and even oil if you like but don't expect it to provide the lubrication needed that 2-cycle oil gives you in a premix.  Lycomings have been eating Mystery oil for years but its purpose is to help remove or prevent deposits on valves ...
Jeff

People use Marvel mystery oil?
- Matt Boiteau


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