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Old 10-01-2008, 05:10 PM
turbobenz's Avatar
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Originally Posted by kerry View Post
Mixing transmission oil and engine oil is virtually impossible. Having transmission fluid in your coolant reservoir is not unlikely. The transmission cooler (if you have an automatic transmission) is in the bottom of the radiator. A leak between the transmission cooler and the engine radiator is possible.
unless a transmission modulator springs a leak and atf oil is pulled into the crankcase from the vacuum system
1981 300SD 512k OM603

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Old 10-01-2008, 05:15 PM
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Originally Posted by turbobenz View Post
unless a transmission modulator springs a leak and atf oil is pulled into the crankcase from the vacuum system

Black color seems to indicate engine oil in this case.
1977 300d 70k--sold 08
1985 300TD 185k+
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1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
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Old 10-01-2008, 07:23 PM
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And I'm thinking non-existant other symptoms indicate a possible long term slow leak....
79 300SD - $50 out of pocket purchase
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2003 VW Jetta TDI
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Old 10-02-2008, 07:15 AM
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As someone else mentioned, get the fluids tested to see if there is oil in coolant/coolant in oil. Many cheapo oil tests will test for coolant. You can try putting some Bar's Leaks in, but I doubt it will help on a diesel with all that compression going on. Best be looking for another engine- or do you already have one out of a parts car you had?

80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)
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Old 10-02-2008, 07:41 AM
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The signs point to the headgasket failing between a coolant and oil passage.

Oil pressure is higher than the coolant so it will naturally flow into the cooling system when the engine is running.
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Old 10-02-2008, 08:18 AM
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Sounds like repair time.

BUT there is one caveat to that. IF you put in some coolant additive, especially if it is soap like or bubbly, it can look like a rainbow oil slick in the reservoir. On RARE occasion, you'll get lucky but if it's jet black...
1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
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Old 10-02-2008, 09:05 AM
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I have seen people working at " quick oil change " places do some really really dumb things.


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