[NSRCA-discussion] After run oil?

[John Ferrell]

Marvel Mystery Oil for Air Tools has a rust inhibitor.

John Ferrell    W8CCW
"Life is easier if you learn to plow 
       around the stumps"
http://DixieNC.US

----- Original Message ----- 
From: "Tom Simes" <simestd at netexpress.com>
To: "NSRCA discussion" <nsrca-discussion at lists.nsrca.org>
Sent: Wednesday, May 09, 2007 12:26 PM
Subject: [NSRCA-discussion] After run oil?


> 
> The list is a little quiet this morning, and I'm troubleshooting a
> possible delivery issue with AOL, so I thought I would lob in a question
> likely to spur some discussion :)
> 
> For years I was in the "just run the fuel out and put it away camp". 
> However, I had the occasion to send an engine back to OS because the
> cylinder plating had failed.  To their credit, they replaced the whole
> engine gratis, even though it was a year out of warranty.  Their only
> comment on the receipt was to make sure I was using after run oil.
> 
> I don't think the plating failure was caused by not using after run, but
> I do know that I replaced bearings in that engine very early in it's
> service life and there was internal rust after < 2 gallons through it. 
> At the time I put in stainless bearings and didn't worry about it
> further.
> 
> Some things I *think* I know about after run oil....
> 
> Hobbico AR is Marvel Mystery Oil (MSDS documents are the same) and it
> has no particular anti-corrosion properties.  My understanding is it's
> basically a combination of solvents in a light carrier oil.
> 
> Silicone components in some engines (YS) may be damaged by some commonly
> used AR oils.
> 
> ATF seems to be popular and has good anti-corrosion agents.
> 
> Rislone also seems to be popular - like MMO, lots of solvents but with
> some added anti-corrosion agents as well.
> 
> Synthetic oils (Mobil 1) seem to be safe for all engine
> components (including YS?).
> 
> When OS says in their instructions not to put AR oil in the carburetor,
> they are specifically referring to not putting it through the needle
> valve / spraybar.  Putting AR oil in via the carb barrel is fine, and
> something like 1/4 - 1/2 tsp is an appropriate amount.
> 
> So, if you are using after run oil, what kind are you using and how do
> you keep it from making a mess in your field gear?  I've been using
> Mobil 1 5W30 and applying it with an eye dropper, but I'm looking for
> suggestions.
> 
> Thanks
> 
> Tom
> 
> ======================================================================
>   "Z-80 system stack overflow.  Shut 'er down Scotty, the system's
>         sucking mud" - Error message on TRS 80 Model-16B
> 
> Tom Simes                                       simestd at netexpress.com 
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