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Old 05-04-2012, 02:07 PM   #1
Hawk Medicine OP
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Airhead oil consumption Bulletin 1975

Guys:

I found this over on the R90S board and thought that you'd find it interesting.

I guess that this makes it official. Don't fill up the sump!

http://xa.yimg.com/kq/groups/2355065...l+Bulletin.pdf
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Old 05-04-2012, 02:27 PM   #2
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Whole thread of BMW Airhead Tech Bulletins?

Very interesting.

I was wondering why the dipstick on my '75 R90/6 has a second, lower, full line. This explains it.

Thank you.

Do you have any more of these Ah Ha tech bulletins?

Should we start a thread with nothing but BMW Airhead Tech Bulletins? Does such a thing already exist and I know nothing about it?
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Old 05-04-2012, 03:11 PM   #3
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Good to see this in writing, as I've trusted the common wisdom on this for a while now.

Now if you could only find a similar doc decreeing what brand and grade of oil that should be used to not fill to the max line...

But then there'd be one less thing to argue about here on rainy days.
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Old 05-04-2012, 03:31 PM   #4
blaine.hale
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At one point, I'd fill to the top line and noticed a lot of oil consumption. I finally settled on about 2.0 US qt (halfway between the 2 markers on the stick) and that oil consumption all but stopped completely.

Wonderful to see my observation in writing there! Thanks for posting this.
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Old 05-04-2012, 04:54 PM   #5
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I heard of that bulletin back in the day, but had never actually seen it. I put 3 piece oil control rings on my 90/6. Check oil level at every gas tank fill until you learn your uses and adjust as knowledge develops. My 79 RS needs a top up every 2 tank fulls or so.
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Old 10-28-2014, 09:36 PM   #6
aitepaeapaea
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just getting used...

...to stuff, having put less than 1500 miles on my new-to-me bike. My instinct tells me that 2 liters of oil for a 1000cc (R100/7) engine is anemic. So I've tended to try to keep it pretty close to top. Now, that said, top, measured on the side stand rather than the right way, is maybe 1/8" or so above the 2 mark on the stick. The bottom line is that I seem to blow through about 1ml/mile. The oil isn't becoming especially discolored. From aircraft engines I'm cool with blowing off some oil. So I guess I'll keep on keeping on until I learn better...
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Old 10-29-2014, 01:23 AM   #7
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From the quoted SB, this is going to get some infamous wrench upset.

We've been saying and doing this for years:

Quote:
For a foolproof oil level checking, the oil dipstick should additionally
be marked as follows:

make a notch 13 mm/0.51 in. below
the maximum mark.
Although the SB was a CYA for the 1000cc warranty woes, it also applies to the 600 to 800 cc jobbies too.

In my own bike, installing a deeper "3 Qt sump", lowering the oil level and using a longer "A" dipstick (MAX is 16mm lower), I minimized oil blowout thru the breather. A new reed-type of breather valve helped, too.

--Bill
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Old 10-29-2014, 06:39 AM   #8
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IN my and my crews experience, they're all different and have a desired full level specific to that engine . New owners traditionally had the air box and plumbing on late models fouled with oil in no time . Carbon build up in the left cylinder is huge with sidestand users . That by keeping the crank case dipstick topped off . When the engine stops blowing oil thru it, that is the full mark on your dipstick/engine . Add more, the blowbye increases, along with additional pressure on an engine with 80-90 psi already . Then seals become an issue, due to habitual over filling and the increased pressure . My rt level is only 1/8" above the MIN mark . My gs with a Breil extender allows only 1.9 quarts total before blowbye kicks in mega big time . Pre Breil 1.45 quarts was the frightening max. on that engine .
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Old 10-29-2014, 09:30 AM   #9
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"influences caused by the driver like acceleration and retardation"

Is this a service bulletin or a lecture from a police officer? :)


That is about where my oil level has settled to at the moment on my R90/6 and isn't moving. This is as a new airhead owner who has never had one before. I pretty much do this with all of my motorcycles: I change the oil when I get them and then ride them for a while.. Ride them hard a bit. Keep my eye on the oil level and see where it 'stays' and make a mental note. Almost every car or bike I've owned does the same thing if you overfill them and almost all of them are marked slightly incorrectly on the dipstick as to what 'full' is.

On old bikes it'll mostly just burn off and I never notice it. On cars you can damage turbos and catalytic converters, so I do take note of the natural 'full' on everything I own.
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Old 10-29-2014, 09:42 AM   #10
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later airheads too?

Any informed opinion if this bulletin applies to later bikes, or was the dip stick marks adjusted at the factory? The recommended volume for an oil and filter change for the '93 R100R (as per the Rider's Manual) is 2.5 litres.
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Old 10-29-2014, 10:00 AM   #11
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Good question. It may or may not.

Various oilpans (differing in depth) and oil dipsticks (differing in length) have have been utilized over the years.

See Anton's page on this:

http://largiader.com/tech/oilpan/

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Old 10-29-2014, 10:07 AM   #12
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After attending a business meeting for work last week that left me in 'motorcycle parking' on a hill I had to use the side stand against my will. I have no idea how much oil got into the cylinder, but I could have cleared a city block of mosquitoes after I started it up!
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Old 10-29-2014, 11:13 AM   #13
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A BMW service bulletin makes it official? If only it were that simple since a lot of BMW service bulletins don't pan out in reality. This one is yet another. I have known of this bulletin since it first came out. I use to catalog all the service bulletins at the dealership I then worked at.

To me the most dangerous aspect of this bulletin is that some readers might think that their oil level won't go any lower once it 'settles'. This can get you into trouble since I have seen many airheads run completely out of oil. It's not good. Seeing that happen adds up with my own experience. My R69S to my '92 R100 does not stop using oil somewhere in the middle of the dipstick. From what I can tell, when my bikes get down to the half way mark they use oil like they did before or more so. The one oil use pattern that I have seen over and over again is that my bikes tend to not use any oil after an oil change for some time. The oil level remains constant for some time and then it starts going down. Once that starts, I have never seen the level steady somewhere in the middle of the stick.

I suspect oil usage does taper off as the level decreases for some. It never has for me. But I know for a fact that oil usage does not stop there for myself and others. I have seen a number of airheads and oilheads run completely out of oil.

supershaft screwed with this post 10-29-2014 at 11:29 AM
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Old 10-29-2014, 11:31 AM   #14
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Quote:
Originally Posted by supershaft View Post

To me the most dangerous aspect of this bulletin is that some readers might think that their oil level won't go any lower once it 'settles'.
This is a very good point. My R75 has always settled at the halfway mark as has been described. So, I assumed the R100 would do the same. Nope. It just keeps on dropping. The breather setup is completely different, among other things, so I shouldn't have made that assumption in the first place.
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Old 10-29-2014, 11:40 AM   #15
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Quote:
Originally Posted by supershaft View Post

My R69S to my '92 R100 does not stop using oil somewhere in the middle of the dipstick. From what I can tell, when my bikes get down to the half way mark they use oil like they did before or more so. The one oil use pattern that I have seen over and over again is that my bikes tend to not use any oil after an oil change for some time. The oil level remains constant for some time and then it starts going down. Once that starts, I have never seen the level steady somewhere in the middle of the stick.
Odd; exactly my experience x3.

So, can this be considered "normal" usage?
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