[johnshannon]

Originally Posted by allan980

Hi All
I was under the impression that petroleum based oil is bad for the membrane on pumped engines so I use only synthetic ATF and synthetic air tool oil in all my engines
Am I wrong in my thinking ?

I believe all ATF fluids and Air Tool Oil is synthetic.

Johnny

[pgibeault]

" It ran GREAT last time I used it. " said the seller... buyer beware! This is what not inhibiting your engines can do...!

[floyd]

Originally Posted by pgibeault

" It ran GREAT last time I used it. " said the seller... buyer beware! This is what not inhibiting your engines can do...!

Guys, I can't remember the last used engine I bought that didn't need bearings. Until you run it and check it while it's hot you won't know for sure how the bearings are, even when they feel smooth. I've worked on engines that the bearings felt good on, but when I ran the engine the bearings were done. And when I removed them they were shot. I buy all my used engines with the expectation that I have to change the bearings. And I'm usually right on. That's why I keep over 400 bearings in stock. Cheers Floyd

[FD av8r]

Yep I ruined some great and expensive motors back in the day until I discovered after run oil! I think it was Clarence Lee in RCM magazine that I saw extoling the virtues (and low cost) of air tool oil and ATF and I followed that advice successfully until I sold my last nitro engine.

Good reminder for all, because 2C and 4C motors are more costly now than any time Ive been in the hobby.

Daryll

[floyd]

Originally Posted by FD av8r

Yep I ruined some great and expensive motors back in the day until I discovered after run oil! I think it was Clarence Lee in RCM magazine that I saw extolling the virtues (and low cost) of air tool oil and ATF and I followed that advice successfully until I sold my last nitro engine.
Good reminder for all, because 2C and 4C motors are more costly now than any time Ive been in the hobby. Daryll

Clarence Lee used to swear by Marvel Mystery oil also. Since I've been able to buy it once again in Canada my new after run oil mix is a third of each, air tool oil, ATF red tranny fluid and Marvel Mystery oil. The Marvel Mystery oil is the thinnest of the three. Any oil is better than none. Cheers Floyd

[Tim J]

Hey Floyd where do you buy the Marvel Mystery oil, I use air tool oil.
Tim J

[floyd]

Originally Posted by Tim J

Hey Floyd where do you buy the Marvel Mystery oil, I use air tool oil. Tim J

Both Walmart and Canadian Tire stock it now in Ontario. I haven't seen it in Canada for years until recently. If your Canadian tire doesn't stock it they should be able to order it in. It shows up on a Google search. The bottle is 946ml and is in the picture. Cheers Floyd

[Tim J]

Thanks Floyd, will have a look next time I'm in the city.

[rcflyer1942]

Yes,I made the mistake of just putting my OS70 4 cycle on the rack a couple of season with out proper lubrication, the result was a complete rebuild. it will not happen again

[Cougar429]

As mentioned many times, I use a 50/50 mix of ATF and Air Tool Oil for both assembly and storage, (for well over 3 decades now). Either will likely work fine.

Never had any issues with gaskets, seals or diaphragms.