You might want to try Valvoline's MaxLife or other "high mileage oil". It doesn't cure anything but it does seem to improve hard, brittle old valve stem seals, reducing oil consumption.
I have used it in several cars and it does make a difference. Also, the latest version of Synthetics, like Mobil 1 supposedly also have these seal conditioners added.
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)
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