Need help in diagnosing a motor problem in my 03 a4 quattro 1.8 turbo.


Asked by Jan 01, 2015 at 01:22 PM about the 2003 Audi A4 1.8T Quattro

Question type: Maintenance & Repair

One afternoon while checking the oil in my wife's 03 a4 Quattro 1.8 turbo I noticed that the water reseviour was full of dark fluid appearing to be engine oil. When I checked the oil there was barely any on the dip stick. I had high hopes that after allowing our daughter to use the car that she might have added oil to the wrong place. But unfornately there appears to be bigger problems at hand. Normally the car doesn't use any oil and as of now it still runs great, but after adding some oil to the engine and running it for a few minutes there is water in the engine oil as well. I done a compression test and all cylinders still have over a 170psi. Like I said the car still runs great but this oil exchange is not right. I'm wondering if someone else has maybe had the same problems and could give me some advice in witch direction I should go in diagnosing the problem. I would hate to pull the head and that not be the problem.

4 Answers


Look at the oil cooler first, second would be seal on the turbo. Your compression test looks good. My bet would be oil cooler leaking into the radiator.


KenF , thanks for the advice on the oil cooler. Any suggestions on where to look for a diagram of the motor components?


I'm not very familiar with your make of car, I'd try some of the specialized Audi forums around, they'll be able to give you specific information. Your symptoms are a classic sign of a leaky cooler, however. If you rev the engine and see bubbles in the radiator or in the reservoir, then you might want to look at an intake or head gasket. There is a type of test that can look for exhaust gas (spent carbon) in the radiator fluid as another proof of a bad head gasket, but I'd start with ruling out the oil cooler first.

1 out of 1 people think this is helpful.

go to the vw dealer and head to the parts counter. ask for a schematic of the oil cooler and they will print it and the part number sheets out for you for free.

Your Answer

Add photo

Related Questions


Looking for a Used A4 in your area?

CarGurus has 12,956 nationwide A4 listings starting at $1,500.


Search Audi A4 Questions

Audi A4 Experts

#1 Deathjam4
Reputation 2,590
#2 FordNut
Reputation 750
#3 lukeyramone
Reputation 450
View All

Related Models For Sale

Used BMW 3 Series"
1,627 Great Deals out of 39,404 listings starting at $888
Used Audi A6"
153 Great Deals out of 6,667 listings starting at $1,995
Used Mercedes-Benz C-Class"
868 Great Deals out of 31,811 listings starting at $1,900
Used Audi S4"
51 Great Deals out of 897 listings starting at $3,900
Used Audi A3"
74 Great Deals out of 4,108 listings starting at $3,500
Used BMW 5 Series"
675 Great Deals out of 18,822 listings starting at $1,500
Used Honda Accord"
1,272 Great Deals out of 77,636 listings starting at $1,395
Used Ford Mustang"
716 Great Deals out of 41,261 listings starting at $900
Used Audi A8"
33 Great Deals out of 1,817 listings starting at $2,995
Used Mercedes-Benz E-Class"
781 Great Deals out of 22,551 listings starting at $1,850
Used Chevrolet Camaro"
812 Great Deals out of 38,799 listings starting at $2,650

Used Cars For Sale

2017 Audi A4 For Sale
5 Great Deals out of 6,214 listings starting at $31,200
2016 Audi A4 For Sale
9 Great Deals out of 303 listings starting at $24,999
2015 Audi A4 For Sale
19 Great Deals out of 380 listings starting at $19,999
2014 Audi A4 For Sale
42 Great Deals out of 785 listings starting at $17,463
2013 Audi A4 For Sale
60 Great Deals out of 945 listings starting at $12,950