What viscosity oil are you using? I wouldn't use less than a 10w-30, and preferrably synthetic in the 850. Did you get any service records with the car? It could have been overheated in the past, then all bets are off. Can you see into the camshaft area if you take the oil cap off? What's it look like? Should be clean and not dark with baked on gum and varnish. If its got the baked on stuff then I would bet the previous owner did keep up with regular oil changes or worse yet it was overheated. Just a guess on my part.
Mike
'95 850T
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