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Any opinions on theses Compression Test Results - '91 740 Turbo 700 1991

posted by  Allanwayne on  Sat Feb 7 06:50 CST 2004
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last visit: Sun Jul 8 15:05 CST 2012
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Hello, as part of tracing high oil consumption I did a compression test. Some oil leak was found at the distributor and there is some oil in the turbo output hose, but I am wondering leakage at the piston rings.

Odometer is 211 000 km (132 000 miles)
Published specs say min. 128 PSI with max 28 PSI difference between cylinders

Here are the results:
CYL 1 2 3 4
Dry 130 130 143 145
Wet 145 140 153 145

These values are within specs, but not as high or uniform as I would have liked.

I have not heard of any guidelines for differences between wet and dry tests so I am still unsure about the rings as a source of oil consumption.
Also don't know how this compression compares to other models of this age / mileage.

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