Head gasket or not ???? - Mercedes-Benz Forum

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post #1 of 14 (permalink) Old 03-18-2017, 10:16 AM Thread Starter
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Head gasket or not ????

Friends recently I replaced cylinder head and new gasket but I still have oil coming into water reservoir I mean this time pure oil not the milkshake mix, not too much but it gives me headache, by the way, the car does not overheat at all nor hesitate. is there any possible issue other than gasket (where does the oil come from)?

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post #2 of 14 (permalink) Old 03-18-2017, 10:38 AM
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First more info.

V8 or 6

How many miles since new gasket?

What is a little? Just sheen or teaspoon?

Have you done a leak down test?

Any sign of bad gasket by bubbles/pressure in overflow reservoir tank?

Why was head changed?
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post #3 of 14 (permalink) Old 03-18-2017, 10:40 AM
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AFAIK, the head gasket is the only known culprit for mixing coolant and oil on a standard ICE.

If you have oil in the coolant, and you sure that the head gasket job was done correctly, the, I might suspect that what you're seeing it is not engine oil but ATF. What is the color of the oily film in the reservoir?

The transmission cooler is an integral part of the radiator, and if there is a leak, you'll be mixing ATF and coolant. NOT good. Stop driving and investigate right away.

Good luck,
Steve
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post #4 of 14 (permalink) Old 03-18-2017, 10:54 AM Thread Starter
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Originally Posted by Drbobme1 View Post
First more info.

V8 or 6

How many miles since new gasket?

What is a little? Just sheen or teaspoon?

Have you done a leak down test?

Any sign of bad gasket by bubbles/pressure in overflow reservoir tank?

Why was head changed?

its S320 , how much? its more than teaspoon, about the leak down test, unfortunately our mechanics don't do it, no sign of bad gasket no bubbles or even a pressure in the overflow reservoir tank, the head changed because I had a small crack in on of the valves and the second piston was overflowed with water.

oh the new gasket has just 2000 miles on it.

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post #5 of 14 (permalink) Old 03-18-2017, 11:27 AM Thread Starter
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Originally Posted by Steve_B View Post
AFAIK, the head gasket is the only known culprit for mixing coolant and oil on a standard ICE.

If you have oil in the coolant, and you sure that the head gasket job was done correctly, the, I might suspect that what you're seeing it is not engine oil but ATF. What is the color of the oily film in the reservoir?

The transmission cooler is an integral part of the radiator, and if there is a leak, you'll be mixing ATF and coolant. NOT good. Stop driving and investigate right away.

Good luck,
Steve
I just measured the ATF level and I used a piece of wire 27 inch long from top to the first mark of oil. The oil in the reservoir tank is brown as i said before not even the milkshake color. Could it be I had the cooler?

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post #6 of 14 (permalink) Old 03-18-2017, 04:48 PM
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Have you removed the oil in the reservoir and have it come back? If so, how fast does it return?
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post #7 of 14 (permalink) Old 03-18-2017, 08:23 PM
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post #8 of 14 (permalink) Old 03-18-2017, 10:35 PM Thread Starter
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Have you removed the oil in the reservoir and have it come back? If so, how fast does it return?
Yes I did two times and it comes back within a week.

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post #9 of 14 (permalink) Old 03-18-2017, 10:38 PM Thread Starter
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If it's a RHD car it's the oil cooler under the manifold at rear next to the oil filter.
No its not a RHD car.
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post #10 of 14 (permalink) Old 03-19-2017, 01:43 PM Thread Starter
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Originally Posted by Drbobme1 View Post
First more info.

V8 or 6

How many miles since new gasket?

What is a little? Just sheen or teaspoon?

Have you done a leak down test?

Any sign of bad gasket by bubbles/pressure in overflow reservoir tank?

Why was head changed?

could it be possible that oil escape through this timing chain cover as shown in the picture attached below due to bad o ring


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