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Old 05-04-2012, 01:07 PM   #1
Hawk Medicine OP
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Airhead oil consumption Bulletin 1975


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!

Hate rots the pocket that carries it.
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Old 05-04-2012, 01:27 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, 02:11 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.
Current: 93 R100GS, 03 XR650R
Prior: 73 CB350, 77 R100/7, 83 R100RT, 04 XR650L
I love every motorcycle I've owned and even some that I haven't.
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Old 05-04-2012, 02:31 PM   #4
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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.
1974 BMW R90 /6
1968 Bultaco Matador MK3
1973 BMW R75 /5 Toaster LWB
1969 Bultaco Bandido MK2
2013 Husqvarna Terra TR650
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Old 05-04-2012, 03:54 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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