I've got oil in the coolant/radiator

[achtung3]

Can anyone give some advice?

I got oil in the coolant reservoir/radiator, and took to have it checked, the weep hole is bone dry, and was told that the only other place is the head gasket.

Is there any other place that I should be checking?

I have a 1990 k75s.

[Laitch]

Please put the year and model of your bike in your membership profile so it will show up in all of your posts. That way members encountering this thread if it becomes epic won't need to backtrack to find out the bike's model and year. It's also helpful to put the model and year in the title of the thread.

Who "checked" this bike for you? How long have you had this bike? When did you first notice this? What's the proportion of coolant to oil in the reservoir gauge? Do you see any bubbles in the reservoir when the bike is running? Done any maintenance lately involving the coolant?

[achtung3]

Thanks for the reply, I just entered my bike in the profile.
 
Got in 2010, 19+K on it

4/11 24K service by indp mechanic, new fan (old fan shaft rusted stuck)- local trusted bmw mechanic

rode around- don't remember fan ever coming on.

Always changed oil at 3k

couple of years back remember seen some grey foam inside of the coolant reservoir and cleaned replace the reservoir coolant a couple times.

7-8-16 decided to check to see if there is coolant in the radiator, opened the cap of radiator added coolant to the middle of the neck and some grey foam come up, close the cap and went on a 2hr ride- hot day.

On the way home stopped at bmw indp mechanic for some other stuff and noticed the rear tire was totally wet and soaking in coolant and oil, left the bike at the ind bmw mechanic and this week the mechanic said the the weep hole is bone dry, and the other place the oil could be coming from into the coolant is thru head gasket, the mechanic said there was a lot oil inside of the coolant (I don't know what proportion) but I never noticed that the oil level is lower than on any last changes, there is no water in the oil from what I noticed in any of the prior oil changes just this grey foam inside of the coolant reservoir.

[Laitch]

 That's the way to provide background for a problem, Achtung. :2thumbup:

Your response seems to indicate that you have never done a thorough replacement of all the coolant in the system during the six years you've owned it. If that's the case, the coolant has degraded to the extent that precipitates of many varieties caused by the aging coolant are changing its color, thickness and effectiveness. Start there. Do a thorough flush of the coolant system and replacement with fresh coolant following guidelines in a manual like Clymer, from posts on this site, or from Snobum's guidelines describing the procedure. Read Snobum's text thoroughly. I think you'll find some familiar descriptions. Coolant replacement is at least a biennial procedure.

If you live in a climate that gets warm in the summer, your fan should be running occasionally in traffic. Sometimes its helpful to put your general location in your profile so interested respondents can get an idea of your riding conditions without having to ask.

You check coolant levels on your bike by looking at the overflow tank gauge then adding coolant when needed, not by depressurizing the system to look in the radiator. If the level in that tank is kept at max, that should be enough. You're beyond that now. You must do a thorough flush and replacement to remedy neglect of the coolant system. Afterwards, if symptoms persist, you could get an exhaust gas analysis of the coolant.

[Martin]

Remove the spark plugs a check the condition, you could also check for bubbling in the filler neck with the cap removed cold and the tank partially lifted. The other slightly more expensive way is to have a workshop, who have a tester for checking exhaust gas in the filler neck do a check. It involves a device which is placed in the filler neck, it contains a chemical which changes colour when it detects combustion gas. there is also another device that pressurizes the cooling system and detects leak down..
Regards Martin

[stokester]

That's the way to provide background for a problem, Achtung. :2thumbup:

Your response seems to indicate that you have never done a thorough replacement of all the coolant in the system during the six years you've owned it. If that's the case, the coolant has degraded to the extent that precipitates of many varieties caused by the aging coolant are changing its color, thickness and effectiveness. Start there. Do a thorough flush of the coolant system and replacement with fresh coolant following guidelines in a manual like Clymer, from posts on this site, or from Snobum's guidelines describing the procedure. Read Snobum's text thoroughly. I think you'll find some familiar descriptions. Coolant replacement is at least a biennial procedure.

Good advice, I used Snobum's site for my airhead maintenance and followed when I picked up my K75.  It's an easy procedure and I keep a 40% mix of coolant/distilled water in my garage for the biennial maintenance.