[Bernie]

When I got my CBR250R two years ago, the oil level started to fill up for some strange reason. I took it to the dealership where I bought it who told me it was because I put too much oil on the chain after washing and that crept into the oil.

14 months later, the same problem arose and the dealership said that I had over filled the oil level - I never have and still haven't ever put oil in it. We agreed to disagree and I had to pay to get it repaired.

Now, after leaving my bike unused for some time, the oil level which was going down, is now over the full mark!

Any ideas? Petrol or break fluid seeping into the oil?

 

[Aufitt]

Cant be chain lube or BRAKE fluid.

If the oil is milky its water or coolant.
You'll never have to add oil unless you've stuffed up an oil change and ran it when low.
Has the bike ever been dropped?

If you are checking the level correctly as per the owners manual and the DIY oil change thread (start up, shut off, wait 2 mins check when bike is level) -

Go to a different dealer.

 

[roadster]

Yes if its coolant you would see it.

It could also be fuel which you should be able to smell on the dipstick. This would indicate a faulty fuel injector which dribbles when it should be closed. The danger is that if you go on a long run and the engine gets really hot the petrol in the oil will evaporate off and leave your oil level low. It also causes the symptoms you mention where the level seems to change erratically.

regards Roadster

 

[ross350]

Are you sure you are checking it properly?
when the bike is on it's regular side stand the oil level will seem to drop due to the lean angle,
When the bike is perfectly vertical is the only time you should make any judgement on oil level.
also depending on how soon after the engine has been running there is quite a bit of oil still coating the engine internals that gradually seeps back to the sump after the engine has stopped so you should wait until the engine has cooled a little before checking oil levels.
(not that the temp of the engine affects how much oil returns to the sump, but the amount of time it takes to cool is sufficient to ensure the majority of it has.)

If your mechanic is telling you that chain oil is some how going inside your engine then you should record any conversations with him from now on if he is your only available mechanic,if he is not your only option seek another mechanic pronto, record conversations with them also.

 

[Phil A]

If the oil is not off color, it's leaking fuel thru when not running. Another problem this will create is the gas will strip oil from moving parts and you'll soon be doing an engine rebuild....rod bearings won't survive this for long...

 

[Phil A]

BTW...the "chain lube mechanic"....that's the most creative way of saying "I'm an idiot" I've heard in awhile...If the seal around the crank was THAT bad, all your oil would be on the ground under your bike...