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850 burning oil use of additives or synthetic S80

posted by  archtop on  Wed Jun 23 14:54 CST 2004
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Ou 95 burns 1 quart every 700 miles, no leaks, lots of blue smoke. The jury seems to be out regarding additives or synthetic oil to slow down consumption. Any thoughts?








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    850 burning oil use of additives or synthetic S80

    posted by  Dick in Falls Church on  Thu Jun 24 03:54 CST 2004
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    Synthetic is not a mechanic-in-a-can, and isn't likely to help.
    Don't know of any additives which might solve this.
    My guess, and it is only that, is that you probably have bad valve seals.

    Were it mine, I'd probably get a treatment of Auto-Rx and try that. Relatively inexpensive, and has had some really good reports. At worst, it won't hurt anything and you'll be out a few bucks.







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    850 burning oil use of additives or synthetic S80

    posted by  bill d cat on  Thu Jun 24 03:43 CST 2004
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    How many miles are on the motor, what WEIGHT oil do you use, and how religious have you been about oil changes? Additives won't help oil consumption and changing to synthetic oil in a worn motor will generally INCREASE oil consumption. You need to find out where the oil is going before you can stop it. "Lots of blue smoke" is a bad ($) sign.

    -BTC








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      850 burning oil use of additives or synthetic S80

      posted by  archtop on  Fri Jun 25 15:39 CST 2004
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      The car has 155,000 bought when it had 140,000 and then realised it was burning oil. we were told to use 10 w 30, but still no change in consumption. Will a compression test tell us anything?








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        850 burning oil use of additives or synthetic S80

        posted by  someone claiming to be bl on  Fri Jun 25 17:21 CST 2004 [RELATED]

        A compression will tell you quite a bit and is a good starting point. If you have a gauge (they're not that expensive) it's an easy test to do on an 850 ( not easy on a sideways V6). It'll show you if you have a problem on one or all cylinders but it isn't specific. It will show loss of compression but won't tell you if it's a valve, piston ring or head gasket. As you're blowing blue smoke it's most likely piston ring or valve related. If you remove the spark plug(s) from a low reading cylinder(s) and shoot in a couple squirts of oil and retest, a rise in compression suggests a piston ring problem. Good luck!

        bl







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