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  1. #1
    Senior Member Two Rings
    Join Date
    Oct 12 2018
    AZ Member #
    428764
    My Garage
    B5 S4 Avant 2.7t 6MT
    Location
    Seattle

    Traces of Oil in Coolant Passages

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    Hi All, my engine is out for a clutch, new turbos, and gaskets, etc... Taking the hard pipe coolant & aux-after-run pump off. I am seeing traces of oil in the coolant. However, when draining the radiator the coolant is pink without traces of oil. There was no trace of oil in the coolant turbo feed as it drained either. From the pictures, milky fluid is in the upper engine only.

    Any ideas? before I replace the head gaskets & oil cooler. I will remove oil pan later this week to check the crankcase components.

    I am thinking it is an early head gasket failure possibly exhaust gas leakage. A cylinder compress test before the engine out was five cylinders in the mid 170s and one low 160s.

    Any ideas, I appreciate your thoughts. Attachment 293373Attachment 293374Attachment 293375Attachment 293376

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    AKA: gjweyman

  2. #2
    Veteran Member Four Rings CELison's Avatar
    Join Date
    Feb 23 2010
    AZ Member #
    55053
    Location
    Emmaus Pa

    I would suspect that's just gunky old coolant. If it was mixing, all of the coolant would turn milkshaky. Clean it out well, flush everything and the heater core and call it a day.
    B5 S4- K24s, built bottom end, E85 - Gone
    B9 S4- EPL/AWE
    996TT X50 - Marski 700hp

  3. #3
    Senior Member Two Rings
    Join Date
    Oct 12 2018
    AZ Member #
    428764
    My Garage
    B5 S4 Avant 2.7t 6MT
    Location
    Seattle

    I have no heat or very little and you got me thinking that this milky fluid is from there?

    The car has been on jack stands for 4 weeks now since I drained the engine fluids. So maybe the H Core has drained into heads while sitting so long. Thanks CELison I'll check it too

    Sent from my motorola one zoom using Audizine Forum mobile app
    AKA: gjweyman

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