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Old 01-26-2014, 08:43 PM   #1
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Default Can after run oil go off?

Hi guys, i just have a question. Is it possible for after run oil to go "off"? I went to put some after run oil in one of my rc's today and when I put some in I noticed that it had turned a funny brown colour. I don't get to use my nitro rc's very often so the bottle has been standing for a while. (Although it's not very old). It's the ZAP brand after run oil.
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Old 01-26-2014, 10:46 PM   #2
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Oxidation has changed the color of your after run oil.

I wouldn't use it anymore for engine maintenance oils after oxidation had occur.

You could use the oil for lubricating garden locks, door hinges, hole keys.
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Old 01-27-2014, 01:45 AM   #3
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Yes. Don't use it for engine maintenance anymore. The same can also happen if you leave the bottle in direct sunlight as well. I do have after run oils in my kit which are quite old and are still ok as they've been kept airtight and out of sunlight/frost etc so there isn't really a shelf life per se. Depends how you are storing it!
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Old 01-27-2014, 04:04 AM   #4
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Originally Posted by xrayracer1 View Post
Hi guys, i just have a question. Is it possible for after run oil to go "off"? I went to put some after run oil in one of my rc's today and when I put some in I noticed that it had turned a funny brown colour. I don't get to use my nitro rc's very often so the bottle has been standing for a while. (Although it's not very old). It's the ZAP brand after run oil.
i use auto transmmission fluid as ARO for the past few year,so far i didn't facing any problem. antioxidant is one of the main additive in ATF.
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Old 01-27-2014, 04:05 PM   #5
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Thanks for the info guys.
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Old 01-27-2014, 11:45 PM   #6
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i used trans /oil and when we pulled piston out it was all stuck to inside of piston have had no trouble with singer mashine oil //wollies $2.50
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Old 01-28-2014, 05:45 AM   #7
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i used trans /oil and when we pulled piston out it was all stuck to inside of piston have had no trouble with singer mashine oil //wollies $2.50
GREG
singer oil similar to one way bearing oil
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Old 01-28-2014, 06:49 AM   #8
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WD-40 works just as well as the above mentioned and is cheap.
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Old 01-28-2014, 08:48 AM   #9
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Default After run oil

Been using Marvel Mystery Oil for probably 30 years and the quart I bought back then still is fine. Was told by someone in the outboard industry not to use WD-40 , the contention was when the liquid evaporates it leaves an abrasive film.
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Old 01-28-2014, 09:06 AM   #10
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Been using Marvel Mystery Oil for probably 30 years and the quart I bought back then still is fine. Was told by someone in the outboard industry not to use WD-40 , the contention was when the liquid evaporates it leaves an abrasive film.
Rick is correct, WD-40 is abrasive when dry so when you fire up the engine each time you are actually scratching the piston and inner sleeve lining. Do not recommend it as after run oil.
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Old 01-28-2014, 06:43 PM   #11
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Been using Marvel Mystery Oil for probably 30 years and the quart I bought back then still is fine. Was told by someone in the outboard industry not to use WD-40 , the contention was when the liquid evaporates it leaves an abrasive film.
Yeah I heard someone tell me once that WD-40 can wreck the engine. Now I know why.
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Old 01-28-2014, 09:09 PM   #12
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What about Carby Cleaner or Brake Cleaner?
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Old 01-29-2014, 09:24 AM   #13
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Default Brake Cleaner vs Bearings

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What about Carby Cleaner or Brake Cleaner?
Actually a different subject but did receive an interesting comment from a bearing source (discussion was focused on slot car bearings but I'm sure it applies) regarding the fact that he felt that brake clean was too agressive to flush out bearings (we can assume the same goes for the more agressive carb cleaner) and that motor spray would be safer.
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Old 01-29-2014, 10:46 AM   #14
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I'm going to +1 on the Marvel Mystery Oil. I started using it when I realized the Hobbico ARO I was using was the same stuff. Same color, smell, everything.
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