1992 BMW R100 GSPD Oil Consumption

Discussion in 'Airheads' started by Grayghost66, May 21, 2013.

  1. Grayghost66

    Grayghost66 Been here awhile

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    Hi All,

    Just got back from a 2,750km extended long weekend ride through the US. My GS performed great but should I be concerned with the oil consumption? Here are a few details, if you could let me know your thoughts it would be appreciated. I just need to know if this is normal or if I might have an issue;

    1. I am the original owner (stating this because I know the complete bike history)
    2. Ridiculous amount of oil changes, sometimes at intervals of 2,000km. Absolute minimum of 42-50 oil changes since I've bought her. All I've documented in a log.
    3. Total mileage is 43,000km
    4. The ride we were just on was "spirited" lets just say "higher" :evil highway speeds for extended amounts of time.
    5. I do have a 6% over 5th gear (thanks Bruno Machine)
    6. After the first 1,200km running like that I needed to add .4 litres of oil
    7. Another 1,200km I needed to add another .4 litre.
    8. Total consumption in 2,750km was 1 litre.
    9. When I left Toronto I was running 10w40 Golden Spectro Dino oil (cool out) and we hit some seriously HOT weather in the US. I started topping up with 20w50 MC oil.
    Soooo what do you think? is the oil consumption what you would consider normal, or is pulling the heads, a valve job and new piston rings in this winters project "to do" list?

    My friends can keep their Vstroms. I like my Airhead.

    Grayghost
    #1
  2. chollo9

    chollo9 Screwed the Pooch

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    I wouldn't think that 1/3 quart of 10w40 per 500 miles on an airhead with 26000 miles on it would warrant a teardown (sorry, but while I can think in terms of kilometers and such, I have to convert for this type of thing).
    #2
  3. GJUNKY

    GJUNKY Adventurer

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    Sounds normal to me.
    Why are you changing the oil so often?
    42-50 oil changes in 43k
    #3
  4. patrkbukly

    patrkbukly 52 Weeks of warm

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    ...stock in BP now???
    ...were you anywhere near Valdez Alaska in the 80's.

    Ok jus kidding, to me 1/3rd quart per 500 miles is fine. I am not a mechanic but I am a GSPD rider of 73,000 miles on her.
    #4
  5. darklight79

    darklight79 drink it , ride it , nail it

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    Miles ? Has the drainplug hole stripped out yet i overfill seems to happen by accident when it burns down to the max mark change out. Filter every 6 thousand oil every 3 thousand might burn 1/4 of quart in between changes
    #5
  6. Boxer Metal

    Boxer Metal Mad Scientist

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    Did you fill the oil all the way to the top line?
    #6
  7. Beater

    Beater The Bavarian Butcher

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    Describe the process for checking your oil ...
    #7
  8. Grayghost66

    Grayghost66 Been here awhile

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    Base line reference is 2.5 litres with a filter change and 2.25 litres without a filter change.

    1. Start the bike and ride it until warm.
    2. Put the bike on the centre stand on level ground
    3. Unscrew the dipstick, wipe it and reinstall WITHOUT screwing it in. Pull out dipstick making sure it is close to vertical (to get an accurate reading). Then repeat to double check.
    4. Oil is always so clean it is difficult to read.
    5. Fill to the top line as shown with the cross hatch marks on the dipstick.
    Sound about right?
    #8
  9. Grayghost66

    Grayghost66 Been here awhile

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    Always. Top line as demarcated by the top of the cross hatch marks.
    #9
  10. Grayghost66

    Grayghost66 Been here awhile

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    Hmmmm......

    You might be onto something here. Some oil had puked out of the vent hole towards the front of the engine, on the engine casting, close to the dipstick. It was more than oil mist, but less than an overfill "puke out". Not enough to wet the bottom of the engine or get on any of the parts of the bike. Found it odd though.
    #10
  11. Grayghost66

    Grayghost66 Been here awhile

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    Two reasons. I am an maintenance fanatic (always a waiting list for any bike or car I sell) and the second reason is that I really don't ride very much.

    There were some years I only rode 500 - 750 kms, so the bike got an oil change in the spring, one mid summer, and a final one for winter storage. For me it was a "time" rather than mileage factor in changing the oil.
    #11
  12. Airhead Wrangler

    Airhead Wrangler Long timer

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    I think what he was getting at is if you fill oil all the way up to the 'full' mark on the dip stick, it gets consumed relatively quickly until it gets down to about midway between the marks at which point consumption slows quite a bit.
    ...allegedly.
    #12
  13. Grayghost66

    Grayghost66 Been here awhile

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    I need to ask, in your 73,000 miles have you had the heads off, reground valve seats, replaced valves, push rod seals or replaced piston rings?
    #13
  14. gsd4me

    gsd4me 90% bluff

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    Are you using a K&N air filter? If so you may well have early engine wear.
    #14
  15. supershaft

    supershaft because I can

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    Awesome that you added that 'allegedly' AW.

    The BS is starting to get deep now.

    K+N filter? Like most people run them with no oil? Or with oil? With oil, they filter a lot better than paper. I have seen that turn out time after time after time servicing square airboxes. The stock paper filters are crap!
    #15
  16. Airhead Wrangler

    Airhead Wrangler Long timer

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    Yeah, but first you gotta trim them to fit the airbox so that they seal and don't let huge amounts of unfiltered air in. Then maybe they filter. I don't know though. I've never used them.
    #16
  17. R100RT Mark

    R100RT Mark Been here awhile

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    The stock GS sump is like that on my R100R. If I recall correctly it holds a little less oil and has a higher full level for the oil it does have than my R100RT. I changed the sump and pickup on my R100R to the RT type to provide a little more capacity and to give more windage space due to the lower total full level. Seemed to help with oil consumption, but I only have anecdotal information on this. Might be something you could consider if you remain concerned.
    #17
  18. gsd4me

    gsd4me 90% bluff

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    Maybe in the northern hemisphere they work perfectly :wink:, but down here, if you use them the engine is stuffed in a very short time.

    My mechanic uses paper filters only and has the engines running around the country to prove their effectiveness.
    #18
  19. supershaft

    supershaft because I can

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    The dirt must be different down there.

    Yes AW, they do need to be modified to fit right. Once that is done, they filter American dirt way better than the stock paper units. I have seen this play out countess times. That is when they are oiled properly which for some reason nine out of ten K+N's I see here on ADVR and in real life are not. It isn't hard to do and yet people don't do it?
    #19
  20. Biebs

    Biebs BMW Airhead

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    SS you seem to have been a victim of the K&N marketing machine. K&N does a great job of marketing their inferior product. BMW built a well designed and effective Airbox / filtering system.


    K&N filter will give you 3 extra horsepower at 8500 plus RPM good luck!!!:puke1


    It's all about martketing!!!:eek1
    #20