Good day friends, my 2002 VOLKS Passat is mixing oil in the water can , what can be the cause ?.

SOURCE: oil in water resovour vw 2002 passat

This is probably a head gasket problem and not an oil cooler problem.

The oil cooler is fairly easy to test.

Remove the cooler from the engine but do not disconnect cooling lines and then pressurize the cooling system. You can use a radiator test tool to put pressure on the cooling system and look for leaks. If it leaks, replace it.

You may also be able to bypass the oil cooler altogether if it leaks.

The head gasket is another story.

Get a 1/4" pipe to spark plug fitting and put a male air coupling fitting in it.

Then you can charge the cylinders with air from your compressor.

Make sure each cylinder that you test is at top dead center so that the valves are closed.

If air bubbles into your coolant, you found your problem.

If air leaks out your intake you have a bad intake valve

If air leaks out your exhaust you have a bad exhaust valve etc.


If you find this useful, please take the time to rate it.

Tim

SOURCE: Radiator level reducing every day and vehicle overheating

try filling the radiator ,take the car for a ride to get the temp. and pressure up shut the car off and recheck for leaks.also park the car on a surface to see if any leaks under motor where you cant see.tighten hose clamps.sounds like a very small leakor a pin hole.

SOURCE: i have a 2003 volks

As long as you put the correct filter on which if it isn't leaking you most likey did and put the proper amount of oil in there is no way the noise is related to the oil change regardless what type of oil you used.
Unless you used trans fluid or antifreeze but that highly unlikely. Although I did have customers come in that put diesal fuel in there cars. Un fortionly cars can make so many different noises there is no way I can be any help. But ask your friends and or people you work with where thay take there vehicles and if they are satified with there service. I hope you make out ok.

SOURCE: What's the likely cause for an oilcooler to mix

The passages that the oil runs through inside the oil cooler have likely become corroded and are allowing oil out/coolant in. This has been an ongoing issue with vehicles using extended life antifreeze, particularly Dexcool. The antifreeze becomes corrosive and rapidly wears components that it passes through, i.e. radiator, heater core, oil cooler, etc.

SOURCE: What's the cause of oil mixing in the radiator on

If you are sure it is mixing in the radiator, the culprit would be the transmission cooler. you should see 2 small steel lines going into the side of the rad. They carry transmission fluid up to be cooled and sometimes the cooling line inside the radiator will rust out. the cure is to replace the rad. Hope this helps.