Came off a running engine with no leaks. Good threads and appear to have been replacements along the way
These have been tested. Removed from a running engine. No leaks or wetness around the fittings. No belt wear marks on the hoses. Only fits 126 300SD.
1981 to 1985 W126 300SD Oil Cooler Hoses Upper and Lower - USED
$190.00Sale
$155.00
SKU:
DSL-126300SDOCHOSES 
Product Details
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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.