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Donald--you don't say what model your 850 is or where the leak is manifesting itself. Is it a turbo or aspirated? Is the oil coming out a rear seal, filler cap, dip stick? All would indicate that your flame trap is plugged, thus allowing crankcase pressure to build and forcing the oil out through one of the various seals. If it's a turbo, it would not have a flame trap and you would have to look elsehwere for the cause. Is it being burned? Smoky exhaust? We need more info.
I own two 97 turbo wagons, an R and a GLT. The GLT is here in Norway and I run 0-40 Mobil 1 synthetic in it, and I lose about half a quart every five thousand miles. The R is in western Oregon and I use 0-40 in it as well. Many of the European cars (Mercedez and Audi) come from the factory with 0-40 weight synthetic because of the close engine tolerances (0) and the turbo (40). Temp range in southern Norway because of Georgie refusing to sign the Kyoto Agreement is less than in your part of the world, ranging from 15 to 80F. Oregon from 20 to 90F. Both wagons have about 60K miles on the engines, and I have experienced no oil loss in either using a 0-40 weight. Dick
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