Always replace these banjo bolt washers when removing the oil filter housing. All 5-cylinder turbo engines.
Set of two new aluminum washers as shown.
W116 W123 W126 Chassis TURBO Diesel Oil Filter Housing Sealing Rings for Turbo Oil Supply Line
$2.40
SKU:
DSL-TURBOSEALINGRINGS 
Product Details
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$38.50
240D 300D 300CD 300TD 300SD Diesel Oil Filter Housing Leak Fix Kit
A VERY common leak! Don't use paper gaskets or it will come back. GENUINE steel reinforced gasket is No longer made! We are the only source for OE-reinforced waffle gaskets!!
This kit fits ALL 116, 123 and 126 4 and 5 cylinder diesels, 616 and 617 designation. This is one of the most common oil leaks on the older Mercedes diesels from 1977 to 1985. It is often found at the gasket between the engine block and the oil filter housing.
$13.75
12mm Special Short Crow Foot Wrench For W116 W123 Diesel Oil Pressure Line
Removes the oil pressure line at the oil cooler housing to prevent rounding out the nut. Can be used underneath the car.
Getting that oil pressure line off the bottom of the oil filter housing on the 1977 to 1985 240D, 300D, 300TD, 300CD, and W116 300SD is tough. If you break the line or damage the nut, this part is no longer available new.
$3.20
W116 and W123 Chassis Diesel Engine Oil Filter Housing Pressure Plate Gasket
Fits W116 300SD models 1978 to 1980, and all 1977 to 1985 240D 300D 300TD and 300CD
This gasket should be replaced when you remove the oil cooler housing to replace the main block gasket. These get old and hard and will leak due to age. Easy to do it on the bench. Not so easy to do it on the car.