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2000 audi s8 4.2 oil in water . no water in sump and runs on all cylinders smooth . could it be the oil cooler.

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Oil in water could be a leak at the cylinder head gasket. Oil pressure is much higher than coolant pressure so oil will more readily push into water passageways than vice versa. The other alternative you have hit on is that it could be a leak from the transmission oil cooler pipes. Check that the pipes enter the bottom of the radiator> It may be that the oil is cooled by an entirely independent cooler rad in which case there is no opportunity for transmission oil to ever come in contact with the coolant. The check the first possibility, from cold start the car with the coolant filler cap removed. Is the coolant agitated, ignition gases are just as likely as oil to blow past the gasket. Next have the coolant system pressure tested at a garage. They will be able to monitor coolant pressure throughout the duty cycle of the engine: no pressure at cold rising to about 7lbs per sqinch when hot. If the coolant pressure spikes to 15lb or more when cold this is sign of oil or combustion gas pressure ingress. If this detected, at best a new gasket is required and maybe a new cylinder head (if cracked).

Posted on Oct 07, 2010


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