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Ask Jessey Your Own Question
Jessey, ASE Certified Technician
Category: Volvo
Satisfied Customers: 250
Experience:  12 years Volvo, Master Certified in Volvo, 2008 Volvo International Service Training Award, Winner
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Oil in coolant tank 98 s70 t5

Customer Question

oil in coolant tank 98 s70 t5
Submitted: 7 years ago.
Category: Volvo
Expert:  Jessey replied 7 years ago.
Customerbr />
Already replaced the radiator, are you getting even more oil in the tank or is it still residual?
Customer: replied 7 years ago.
its brown slude but not overheating.fills up quick.
Expert:  Jessey replied 7 years ago.
Looks like you have a leak in your head gasket. The gasket seals the Cylinder head to the block of the engine. Slight crack in the gasket right at the oil channel. The pressure from the oil channel is greater then the pressure of the cooling system, thus pushing in the cooling system. The cylinder head needs to removed and inspected for damage. Then if all is ok with the cylinder head, replace the gasket.

Once that is replaced. I recommend several flushes of the cooling system to remove all oil from system, if not in time the hoses will swell and burst.

I hope this helps
Customer: replied 7 years ago.
that has nothing to do with turbo?
Expert:  Jessey replied 7 years ago.
It is possible that the turbo has gone bad, but most commonly when the turbo goes out. It leaks the oil into the exhaust system and bellows smoke out the back.

The most common occurrences with oil in water.

Leaking oil cooler which is located in the radiator. Which you have already replaced.

Then the head gasket.
Customer: replied 7 years ago.
there is no oil in or on dipstick or cap.
Expert:  Jessey replied 7 years ago.

You have replaced the radiator already. If the turbo is bad it could mix oil with the water. But more commonly the seals give out on the turbo and allow oil into the exhaust.

There can be a crack in the head gasket near the oil galley, the pressure of the oil is 60 psi at cruising speed and 20 psi at idle. The coolant pressure only reaches 17 psi max. This can cause the oil to push into the coolant from the head.