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Coolant service warning in Skoda superb V6 2.5 TDI


vprasanna

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Hi I think this problem has been discussed before, but I do need some advice on how to go about rectifying the problem.

 

Problem:

 

There is oil in the coolant, and the coolant is brown in colour, with oil trace on the cap.

The engine is getting slightly heated up( I can feel it), but the coolant temperature is not crossing 90 Deg C in the guage while driving, the temperature never crossed the 90 Deg C for the whole of last week .

The vehicle has run just 28 k kilometres and never faced any problem

 

Diagnosis:

 

The skoda service center in India does not have a compression check to study whether head gasket  had failed.

The skoda service center is not capable of doing a pressure test on gear pump to study whether it is leaking.

The skoda service center is not ready to open the engine cooling circuit to see whether there is a leak there.

 

Solutions offered by Skoda :

  1. Option 1 : Replce the gear box oil pump, and few seals, the problem may get resolved ( the basis of this resolution is based on history, they had same problems in few other cars and this solution has worked).
  2. Option 2: If option 1 does not yield a good result, then Skoda will replace the engine oil coolant circuit.
  3. Option 3: If option 1,2 fail they may check the head gasket.
  4. Option 4 : There is no option 4 of checking turbo or anything.... as they do not suspect turbo.

My own analysis :

I have collected oil sample from engine and gear box, and the oil from coolant and studied for a visual match. The oil in coolant matches a lot with engine oil, so I am suspecting engine coolant circuit. Apart from Skoda technician, I took the car to a local garage who specilises in tuning cars, and the specialist who checked the car (just by checking the engine temperature, has said that the leak may be from the cooling circuit of engine and the oil is entering in to cooling water circuit, he is very confident that the head gasket of this engine may be intact as no presusre built up notice, and no problem will happen to an engine which has clocked 28 k kilometers).

 

I do not wish to go ahead with any solution (option 1, 2, 3) without zeroing on the real problem.  Request fellow V6 engine drivers to share their opinion, and whether my approach on diagnosis is right. Also which circuit may have high chance of failure?

 

If engine cooling circuit needs to be replaced, is it just a heat exchanger system where oil is circulated through coil and cooling water flows through the exchanger for cooling. How costly is this part, and is it possible to replace this without much problem?

 

Thanks in advance...

Prasanna

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Usual cause of oil into water is the oil cooler itself, an internal failure causes oil to enter the coolant. I would not think head gasket or oil pump at that low mileage.

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Do they really mean "gearbox oil pump"?  Is this lost in translations somehow?

 

I thought the gearbox oil pump is self contained in the gearbox, and only pumps transmission fluid and not engine oil?

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  • 1 month later...

Dear all,

 

Thanks for your support and prompt identification of the problem.

 

Found oil cooler to be defective, replaced it recently and the coolant warning has stopped. 

 

I have imported the original oil cooler from UK ( RBS spares through ebay uk), Part No - SKODA SUPERB, VW PASSAT 2.5 TDI OIL COOLER (059117021B) at 75 UK pounds ( inclusive of air shipment to India), and i have done custom clearance directly through the courier company.

 

I could not do any DIY as i felt this job is for the specialist service center.  Took the vehicle to a service center, and they have replaced the pump in 4 hours , flushed the tank and intercooler twice before filling the coolant.

 

Superb is running fine now.

 

Thanks once again for the Briskoda forum...

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