1994 audi80 petrol oil and water mixing. - 1997 Audi A4

Could be a stuck open injector or a pressure regulator.

Change the water pump?

That other answer is suspect , If rings are damaged you will not get compression full stop , you changed head = the head or gasket ??? you should have run compression test just screw into plug socket , If your cylinder is down in compression, it indicates the problem cylinder, It can be due to rings or cracked head or bore , or gasket , come back when you know compression readings , If you have gasket blown the cooling water in rad will mix with oil and show foam . and compression, petrol mixing with oil is due to petrol not cutting off , where is petrol mixing in the sump?

good day is this diesel engine or petrol?both tipes it may be the head gasket blown,causes overheating.on diesel it a posiblity that is can be the oil cooler mixing those 2 also.

Probably water leaking into engine from head gasket. A few engines are prone to condensation from large cam cover surface area. Any oil or smell of petrol in water system?

Check oil by draining. Trans tank on radiator bottom may be oily slick you see if oil pan drained clean. Then trans is probably contaminated with antifreeze and that's what is mixing.

Crack in head passages could link oil and water, if you verify antifreeze and oil mixed in oil pan.

If water is still mixing with your oil then that means that you have a cracked head, worped head, blown head gasket or your block is not level..

Hi Marsha, Many people mix brands of oil specified for either petrol engines and the same is true for oils specified for diesel engines if topping up, but it's not a good idea....It is a very bad idea to use an oil specified for one type of engine in the other. I would suggest never mixing oil manufactured for a diesel engine in a petrol engine or visa versa. The reason is that the diesel engine is dirtier than a petrol engine and manufactures of oil formulate it to have more cleaning chemicals than that used in petrol engines....Mixing the two can result in a build up of sludge which can actually block the lubrication system of the engine causing in some cases severe damage. Regards John

Is it overheating? Is the oil in the top of the radiator? It is not a freeze plug, it would be leaking water/ coolant. Check to see if steam comes out the exhaust after it has been running a minute. To be sure, take it to a radiator shop, they will do a compression check and tell you which cylinder it is, it is most likely a head gasket, but if you don't have any of those symptoms, it might be the transmission cooler in the radiator leaking,(rare). If you have water in the oil, then we got something more serious. Check it out.

I need a little more information before I can help with this problem. Is the leak from the oil pan? From where the engine mounts to the transmission? Is it water or coolant? Is there any noises associated with your motor since this problem started?