You can try one of the "high mileage engine oils" such as MaxLife. They help old, hard engine seals with conditioners. Its no magic and it isn't perfect, but I have seen so good results with engines that need valve stem seals. Doesn't eliminate oil useage, just reduces it.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)