What pressure do you think the oil return line on the turbo reaches on the highway?

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800

Somewhere between oil pump pressure and crankcase pressure! Is this a test? Have you been playing with a pressure gauge?

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

There should be no pressure at all. Any back pressure or "head" at all can cause the seals to leak oil into the intake or exhaust.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

The metal oil return line that was there stock was removed long before I owned he car and someone hose clamped rubber oil line to it. I'm wondering if on the highway it's spraying my turbo, intake manifold, and exhaust manifold from the increase in pressure. There's a layer of oil that builds up around there and comes back a few days later after I clean it off. Unless the turbo housing can crack and leak, it's the only thing I can think of.

__________________
84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800

Sounds like a leak or they used radiator hose and the oil is weeping through it. Most agricultural or truck places will have oil rated hose for sale.

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$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment

Compare the ID of the supply pipe with the drain pipe. There's shouldn't be any worthwhile pressure in the drain pipe.

Sixto
87 300D