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Old 05-14-2019, 10:59 PM
JHZR2's Avatar
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Join Date: Jan 2002
Location: New Jersey
Posts: 4,223
OM617 small amount of oil in wastegate hose

I parked my 300cd in late 2012. Itís running beautifully, same tank of fuel and everything.

But all that sitting has shown me that thereís an oil seepage at my boost controller in the wastegate hose.

When I remove the turbo u-tube, thereís a very slight amount of oil sitting in the turbo inlet body.

Is this a sign of blow by (my engine is excellent and has next to none via the oil cap off test) or a turbo seal?


Current Diesels:
1981 240D (73K)
1982 300CD (162k)
1991 350SD (113k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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Old 05-15-2019, 01:50 AM
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Join Date: Jan 2013
Location: Pueblo, CO
Posts: 122
Oil vapor condenses and leaves a slight amount in the intake just ahead of the turbine. Normal. Nothing to worry about.

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