Charles,

Thanks for tip on vac pump. MB tech said yesterday that he put a new vac pump on the car several years ago. The oil consumptiom prob very well may be the vac pump as you suggested - I'll try to look into it. MB tech found stuck oil check valve yesterday; 'installing new oil pump Mon. The car runs great; has very good power; nice and quiet for the vintage - sounds like a well-oiled and well-maintained industrial sewing machine; all cyl have good compression. 'Hope I can drive it another couple of hundred thou. Thanks, again.