[R-390] Marvel Mystery Oil Does Turn To Gum

[Dan Merz]

Hi,  I used Marvel Mystery oil to degunk  my 390a gears when I first got it -
worked great and loosened things up very well - I then oiled it with synthetic oil
and I've been happy with the result - about 2 years into it now and still works
ok.  I may repeat the process in a year or two.  I like the MM oil for cleaning - I
used to like kerosene to clean away grime on gears,  parts,  bicycle chains  etc,
but I think it stinks a bit more.  I would guess you could gum up something pretty
good by putting on an inadequate amount of MM oil and letting it set - not enough
to flush out the old residues that might be there - but I'm just guessing on that.
Does anyone know what MM oil is?  maybe a mixture of kersone and oil ?    Dan.

Robert Meyer wrote:

> I had something similar happen.  I have model aircraft that have glow-fuel
> engines on them.  Someone recommended that I use Marvel Mystery oil to lube
> the engines prior to storage.  I had one engine that sat for about three
> years.  When I went to turn it, it was so gummed up that it took significant
> force to get it to move.  Poured some solvent into it and it freed up.  I
> only use synth oil, now.
>
> Cheers!
>
> '73 de N2DXN
> Bob
> --- ToddRoberts2001@aol.com wrote:
> > I think some people in the past have recommended using Marvel Mystery Oil or
> > mixing it with another lubricant as a good way to lubricate an R-390A RF
> > Deck? I thought I would relate an experience I had with Marvel Mystery Oil. I
> >
> > had a can of the stuff sitting in a cupboard for about 15 years. Some of the
> > oil leaked around the top of the can and after being exposed to the air for
> > 15 years it did indeed turn into some kind of sticky red gummy substance. It
> > would seem this is not a good indicator of the oil for use as a lubricant
> > exposed to air over a long time = 15 years or more? It looks like Synthetic
> > oil or grease would be the best bet for a long-term lubricant exposed to air?
> >
> > 73 Todd Roberts WD4NGG.
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