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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › After Run Oil
09-12-2015 01:49 PM  35 months agoPost 1
rudyy

rrElite Veteran

E. Amherst, NY

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Can I put some after run oil directly into the glow plug hole and the bottom crank case?

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09-12-2015 01:50 PM  35 months agoPost 2
Dr.Ben

rrMaster

Richmond, VA, USA

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Sure you can. Blow out the excess before the next engine run.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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09-17-2015 03:26 PM  35 months agoPost 3
Agilefalcon

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Fort Worth, Texas

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Just an FYI on something I noted. Due to traveling for business - months on end sometimes, I found that Marvel Mystery Oil is not suitable for long term storage. It's fine as an after run, though the better fuels don't seem to require that.

For long term storage I'm using a synthetic transmission oil (for my YS engines) and either that or some petroleum gear oil for my non YS engines.

Chris Berardi
Team BobbyJack's Hobbies

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10-11-2015 07:17 PM  34 months agoPost 4
wjvail

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Meridian, Mississippi

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What Dr. Ben said.

Unless it's a YS or OS with DRS carb.

Then maybe.

If it's a YS or OS with DRS and petroleum based oil, then no.

If it's a YS or OS/DRS engine and not petroleum based oil, then yes.

Cheers,

Bill

"Well, Nothing bad can happen now."

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10-12-2015 03:04 PM  34 months agoPost 5
Rob43

rrKey Veteran

Midland, MI USA

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Could I ask, what is the problem with using Marvel Mystery Oil? I am not using it in my YS91SRX, but I've heard this suggested from a very experienced modeler in my club.

Rob

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10-12-2015 07:32 PM  34 months agoPost 6
wjvail

rrKey Veteran

Meridian, Mississippi

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Here is a rough idea of what is in MMO:
https://www.turtlewax.com/docs/defa...-50094-0315-sds

Here is a PDF of a YS owners manual. Notice the warning near the end.
http://www.ysengines.net/manuals-do...-YSP.pdf?6526ee
IMPORTANT!
Silicone rubber is used in many parts of the YS engine.
Use only glow fuel of methanol for cleaning. Gasoline
and other volatile solutions will damage silicone if used.
As a generality, silicone and petroleum distillates are not a good mix. Your local pro may be getting away with using MMO as an after run oil but it is not something I would do. The working parts of a YS don't have to swell much before you begin to run into trouble.

Cheers,

Bill

"Well, Nothing bad can happen now."

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10-12-2015 08:09 PM  34 months agoPost 7
Four Stroker

rrElite Veteran

Atlanta

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Bill is right on track with this one. YS Parts and Service rebuilds many regulators that were destroyed with MMO or air tool oil. Also Prather, Tower after run oil. Mobil 1 oil OR automatic transmission fluid will not dissolve silicone BUT will swell it and may make your regulator non-functional.

There is a brand of silicone safe after run. ULTRA OIL by Performance Specialties. May be others.

Local club experts are a dime a dozen. And I don't give a rat's rump if they are famous professional contest pilots of great renown and universal admiration.

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10-12-2015 08:09 PM  34 months agoPost 8
Ace Dude

rrProfessor

USA

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Ultra-Oil after run oil is highly recommended for YS/OS engines.

http://www.bj-model-engines.com/ultraoil.html

  

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10-23-2015 04:25 AM  34 months agoPost 9
Agilefalcon

rrKey Veteran

Fort Worth, Texas

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I have found that for extended periods of storage, Marvel Mystery Oil is not a suitable. I ended up with rusted engines. Other engines that were in the same storage but were oiled with heavy transmission/gear oil were in perfect shape.

I think over time, the fine oil in MMO fails to cover the metal surfaces.

Chris Berardi
Team BobbyJack's Hobbies

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10-23-2015 02:37 PM  34 months agoPost 10
Four Stroker

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Atlanta

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Light oils evaporate over time. I have had engines seize up in storage. Ultra Oil actually works. It is not soluble in fuel. Don't know what it is but a single bottle is a lifetime supply. It does not go rancid. It may be some vegetable oil with something to keep it fresh ?

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