Question about BMW 750

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Driving the car for about 4 hours a day,stop and go,i am losing 2 to 3 qts of oil. it looks like oil is leaking from above the upper oil pan on both sides.on the side obove the oil level sender,i see oil running down over the power steering bracket bolt. 1991 bmw 850i

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  • 850i Aug 18, 2008

    no oil leaking from oil filter housing or three hoses connecting to engine from housing

  • 850i Aug 18, 2008

    power steering housing,hoses dry. what are the common oil leaks for this engine other than the upper and lower oil pan?

  • 850i Aug 18, 2008

    there is a puddle the only smoke is from the burning of oil on the exhaust system ,no smoke out the tailpipes,only from hard acceleration briefly up to speed. do not see any oil around valve covers

  • 850i Aug 18, 2008

    no loss of power ,slight miss

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Change top gasket and oil pan gasket for good measure

good luck

Posted on Aug 18, 2008

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If you had an oil leak that allowed 3-4 quarts a day to leak out you would have a large puddle on the ground under the engine, also while driving you would have smoke out the back from oil getting on the exhaust system, do you have a puddle of oil under the car?? do you see smoke while driving in your rear view mirror?? Remember it will be a big puddle and allot of smoke, in order to understand what I am saying poor a cupful of cooking on a hard surface, you will see it will cover an area about the size of the coffee cup, a leak that would account for your oil loss would be bigger than a dinner plate. The other more likely cause is the engine has a broken or damaged piston ring, or a hole in the piston crown, does it miss or have a loss of power??

Posted on Aug 18, 2008

  • yadayada
    yadayada Aug 19, 2008

    No oil leak that is 2-3 quarts is coming from the engine seals, even if the seals are not there you would not loose that much oil, Is the inside of your tail pipe geemarie, oily like thin sludge?? geemarie's last comment indicates he think you are talking about 1 quart a week, no 2-3 a day as your original post indicates, I think you are burning this oil not leaking it. he (geemarie) has it all wrong, forget about the recall's for now and find the source of the EXTREME oil consumption. If you like call me 925-459-0571, Dennis



    Knowledge base: 30 years in the field, master ASE technician

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You need to change the valve cover gasket.
a chilton's manual at the parts store will tell you how step by step.

Posted on Aug 18, 2008

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Check if there is any crack in ur engine and also check ur oil level also it might be useful check the lit if it is tight r not the oil on power steering might be because of oil coming out and poring if not check the sterring oil also

Posted on Aug 18, 2008

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When was your last oil change? Was the oil filter correctly reinstalled. I'd take a run into a service shop and have them take a quick look to see if it is something simple.

Posted on Aug 18, 2008

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  • Gayle Ashbach
    Gayle Ashbach Aug 18, 2008

    I am still researching your vehicle(.FYI Are you aware of two recalls- one on the airbags and one on the coolant system)



    I'll get back to you.

  • Gayle Ashbach
    Gayle Ashbach Aug 18, 2008

    I am going to pass on to you anyhting that i find that might help you wihtout comment so here is the first one (there may be numerous posts!)



    "a horrific oil leak. im pretty sure i have found it. i have about 2 hours into looking for it. laying under the car with a light (getting dripped on) then after i had finally followed the trail as high as i could. looking from the top holding the light at just the right angle, and also a mirror at just the right angle i think i found the beggining of the trail at one of the timing cover bolts on the drivers side. first or second one down from the valve cover. i could be wrong but i dont think i am. seems like a strange place for this much oil to be coming from as there really is no place for it to puddle or anything, but it really looks to be where its coming from."

  • Gayle Ashbach
    Gayle Ashbach Aug 18, 2008

    "The other things to check on the engine right away are the oil pump bolts. Weirdly, they back out, and drop into the pan - no kidding. The oil pan comes in two parts, and pulling the lower pan is a snap - you don't have to remove anything else - when you order the valve cover gaskets, get the lower oil pan gasket at the same time. Dry and Locktite the bolts going back in, and you will not have the problem again.

    Lastly, since you are taking the valve covers off, do the intake manifold gaskets at the same time - they will be right in front of you, and inspect the "breather" on the back of the intake manifold. Another frequent failure item, giving all sorts of driveability problems. Since you are already there . . .

  • Gayle Ashbach
    Gayle Ashbach Aug 18, 2008


    "I would check your valve covers because that is where I was leaking a quart every two weeks from. You can look down with a flash light from each side of the engine and oil will probably be on the exhaust manifold covers or you can run your hand down the side of the valve covers and feel for oil with the engine off."

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