Hi Gilly, I have changed the valve stem seals about 13 years ago it has not burned oil since. When I changed them I also put new seals and gaskets on the front cam cover under the dist and new valve cover gaskets. I was about to change the front cover seals again since they are leaking again.
And the car probably is due for a tune up!
NO smoke out exaust. , But I am interested in the valve stem seal theory? is it sucking air leaning out the mixture? Thanx John

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88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg