103 Engine
If you are experiencing high oil consumption and excessive engine smoke with your 6 cylinder 190E or 300E (CE and TE) or 126 300SE / L with the single cam 103 engine this is most likely what you need to fix the problem.
190E 2.6 300E 300SE Valve Stem Seal Replacement Kit
$29.50
SKU:
GEG-COM103S 
Product Details
Even on low mileage cars the valve stem seals are notorious for getting hard and brittle and letting engine oil pass through to the combustion chamber.
Valve cover gasket required. To order look below.
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$19.50
190E 2.6 300E 300SE Valve Cover Gasket
103 Engine
New valve cover gasket. Common source of engine oil leaks. Must be replaced any time you remove the valve cover. Fits all 103 engines 1986 to 1993. No instructions included.