Gray Oil - Honda Rebel Forum
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post #1 of 38 Old 05-12-2020, 09:23 AM Thread Starter
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Gray Oil

Hey all.. been fighting this problem for a while and tried some suggestions from here but nothing seems to help. My son has a 2009 Honda Rebel CMX250 and within a few days after changing the oil it appears gray and milky. I have drained the puke tube and blew it out with some low pressure air but still an issue. Recently I have cleaned the carbs, replaced plugs, basic maintenance stuff. I assumed it was due to his short rides so I had him do some longer runs to bring up the temperatures but no difference. Any additional suggestions would be greatly appreciated!
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post #2 of 38 Old 05-12-2020, 10:00 AM
 
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What kind of oil is he using? And what is happening with the fuel level when the bike sits with the engine off?Any indication of drips and wet spots under the bike? Does he shut off the tank valve when the bike is not running? Something is contaminating the oil, and the most common cause is fuel overflowing from the carb (float stuck) and draining into the cylinders. Does the oil on the dip stick have a definitive smell? Since your in a position now of attempting a resolution by elimination I'm posing the most obvious questions. I apologize if this is ground you have already covered. You can try to search past post threads for "discolored oil" or "oil contamination" and see if something matches the issue you describe. I would suggest that the engine not be run even after an oil change until you resolve this. As I'm sure you know if the optimum viscosity of the oil is compromised it will compromise the life of the engine. The air cooled twin relies on optimum lubrication to keep that engine from overheating leading to premature metal parts failure and destruction. Best of luck in resolving this.

1986 Honda Rebel 250cc
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post #3 of 38 Old 05-12-2020, 10:02 AM
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Welcome to the forum.

you've already done what I would have in your situation. Because it's counterintuitive, I always ask if the oil level is checked with the bike level and the dipstick unscrewed and resting on the threads? What brand and weight of oil have you been using? Have you tried a different brand? Does the oil level remain stable or go up? To me, gray/milky oil would indicate serious moisture contamination, but that's not possible with an air cooled engine unless someone is adding it to the crankcase to mess with you or your son.

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post #4 of 38 Old 05-12-2020, 02:09 PM
 
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I don't know if this observation has any validity but you can consider it. A link to an ATV forum site that has the grey oil issue.

http://www.atvriders.com/vbb/showthr...ey-looking]Why is my oil grey looking?

1986 Honda Rebel 250cc
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post #5 of 38 Old 05-12-2020, 04:50 PM
 
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Any chance we can get a look at the oil via a picture for diagnosis?

2008 Rebel 250, 2014 Street Triple, 2012 Voyager 1700, 2014 FLD Switchback, 2017 Guzzi V9, 2017 Concours 14
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post #6 of 38 Old 05-12-2020, 04:56 PM
 
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Garage
I would check that the air filter/box isn’t completely soaked for some reason. Open that air box up and check that out if you haven’t.

Since we haven’t seen the gray it’s hard to say but only a small number of ways for water to get into the oil. The other option is metal flakes in the engine... Because bad things are happening. 😢

1985 Honda Rebel 250
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post #7 of 38 Old 05-12-2020, 08:11 PM
 
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My 2 cents, milky oil is water/oil mix. Gray oil sounds like worn out aluminum somewhere...not good...

MC.com ruined this forum

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post #8 of 38 Old 05-12-2020, 08:34 PM Thread Starter
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Quote:
Originally Posted by Nardospark View Post
What kind of oil is he using? And what is happening with the fuel level when the bike sits with the engine off?Any indication of drips and wet spots under the bike? Does he shut off the tank valve when the bike is not running? Something is contaminating the oil, and the most common cause is fuel overflowing from the carb (float stuck) and draining into the cylinders. Does the oil on the dip stick have a definitive smell? Since your in a position now of attempting a resolution by elimination I'm posing the most obvious questions. I apologize if this is ground you have already covered. You can try to search past post threads for "discolored oil" or "oil contamination" and see if something matches the issue you describe. I would suggest that the engine not be run even after an oil change until you resolve this. As I'm sure you know if the optimum viscosity of the oil is compromised it will compromise the life of the engine. The air cooled twin relies on optimum lubrication to keep that engine from overheating leading to premature metal parts failure and destruction. Best of luck in resolving this.
Thanks a lot for the reply, we are using Castrol GTX 10w 40, not sure on the fuel level but no drips or wet spots under the bike. He sometimes shuts off the gas but not always (he is 19 ). The oil does not smell like gas, no different than the oil in my own bike.
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post #9 of 38 Old 05-12-2020, 08:40 PM Thread Starter
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Originally Posted by flitecontrol View Post
Welcome to the forum.

you've already done what I would have in your situation. Because it's counterintuitive, I always ask if the oil level is checked with the bike level and the dipstick unscrewed and resting on the threads? What brand and weight of oil have you been using? Have you tried a different brand? Does the oil level remain stable or go up? To me, gray/milky oil would indicate serious moisture contamination, but that's not possible with an air cooled engine unless someone is adding it to the crankcase to mess with you or your son.
We do check the oil as you mentioned and we are using Castrol GTX 10w 40. I do believe the oil is in about the same place as when I last changed it, but I will keep an eye on it. I left the fuel on to see if it increases the oil level. The bike is kept in our garage so I dont think anyone is messing with us. I appreciate the response and will post if I see a change in the level.
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post #10 of 38 Old 05-12-2020, 08:54 PM Thread Starter
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Here are some pictures, not that easy to take a good picture of oil
Attached Images
File Type: jpg 20200512_204830.jpg (73.5 KB, 8 views)
File Type: jpg 20200512_205006.jpg (88.2 KB, 6 views)
File Type: jpg 20200512_204958.jpg (81.3 KB, 6 views)
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