MMO or other oil control ring tricks?

[DXB]

26 minutes ago, RobertGary1 said:

Warranty issues, FSDO inspector walking up behind you, and just the untested nature with the unique chemistry of aircraft engines. I'm sure MMO wouldn't endorse using this in an aircraft too.

What is unique about their chemistry?  These engine designs are ancient and have widely known properties, and such solvents have been used in them for many decades. I have no warranty to speak of at 18 years SMOH.  MMO is legally unable to endorse use in piston aircraft engines, even though application to deposits in these engines perhaps makes more sense than in a modern car engine. To dodge the pesky FSDO inspector, next time I will use it to flush a cylinder in the middle of the night with the hangar door closed, and maybe also not announce it on the internet . I don't fully embrace that the MMO helped me - it's just an anecdote, but both plugs are certainly no longer oily on the problem cylinder, and they stopped fouling in flight.  

Edited November 4, 2019 by DXB

[RobertGary1]

1 hour ago, Andy95W said:

Two of the maintenance inspectors at my FSDO own their own airplanes.  They would be more interested in MMO use for their own airplanes than for any type of enforcement action.  They would probably recommend its use, in fact.  They might even suggest it's use in flight (off the record, of course.)

 

I hope you get one of those two

-Robert

[RobertGary1]

1 hour ago, DXB said:

What is unique about their chemistry?  

There are a few differences, mostly due to the blend of 100LL vs mogas in cars and the use of ashless dispense oil. Its why you can't fill your plane with Pennzoil.

-Robert 

[DXB]

31 minutes ago, RobertGary1 said:

There are a few differences, mostly due to the blend of 100LL vs mogas in cars and the use of ashless dispense oil. Its why you can't fill your plane with Pennzoil.

-Robert 

Undoubtedly our planes are not suited to current automotive oil, which is optimized for the much tighter tolerances and temperature regulation of modern water cooled car engines. But ashless dispersant oils were originally developed for car engines and adopted into aviation in the 1950s, and tetra-ethyl lead is certainly no stranger to the car engines where MMO was originally used.  

Edited November 5, 2019 by DXB