Genuine Mercedes part with installation tool and video instructions.
For the OM616 and OM617 engines in the W116 and W126 300Sd and the W123 4 and 5 cylinder diesels. When you remove your oil filter housing be sure to check this part. Replace it if it is broken or not seating properly. Watch the video for a full explanation.
1977 to 1985 Diesel Oil Filter Housing Plastic Check Valve Cone DIY Kit
$19.50
SKU:
DSL-CVCONE 
Product Details
High quality genuine Mercedes part.
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1978 TO 1985 TURBO Diesel Oil Cooler Thermostat Kit
More coming Mid-November. For 300D, 300CD, 300TD, and 300SD built in those years. This thermostat has a very limited supply. You might want to purchase while still available. There is NO substitute.
We know it is a surprise to many owners to discover there is a small thermostat inside the oil filter housing. Rather than write about it, watch the video below and Kent will explain the theory of operation and how to get it it.