If your 103 engine makes ticking noises when you first start it up and that noise comes and goes it may be due to one or more failed hydraulic valve lifters.
190E 2.6 300E 300SE Meyle Hydraulic Valve Lifter - 103 Engine
$26.50
SKU:
GRG-COM103VL 
Product Details
Applicable Benz are the 6 cylinder 190E or 124 chassis 300E (CE and TE) or the 126 chassis 300SE / L with the single cam gas engine up through 1992. These are sold individually.
To order a valve cover gasket 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.