Coolant and Oil Leaks on Cadillac Catera

Problem Description and Possible Solution

The Catera often experiences oil leaks from the oil cooler and/or valve cover gasket. The thermostat seal and/or the water pump may develop a coolant leak.

Problem Data
RepairPal Verified
Average mileage: 96,834 (10,000–171,000)
Engine affected: 3.0L V6
5 model years affected: 1997, 1998, 1999, 2000, more2001
62 people reported this problem
Viewing 1 - 20 of 32 comments
my car has oil in coolant reservoir but does not misfire, just took it to the mechanic to check it out.
smoke coming from both sides of the hood when car was warm.. i had the cover gaskets and oil cooler replaced for $1600...
Oil keeps pushing out of valve covers flooding my spark plugs with oil. Already replaced valve cover gaskets twice, how do I fix this problem
All at one time radiator cracked on upper drivers side,replaced with new one,oil cooler leaking and replaced with new one,heater control valve was leaking and replaced with new one,thermostat stuck shut had to replace.replaced intake gaskets etc.Now the car runs rough engine shakes and wont idle correctly.any ideas,, if you have any answers to my new problem..Also went for oil change a year ago once they lifted the car on the rack we heard sounds of something hitting the concrete,both back springs had busted and fell out so i replaced them.replaced relay that controls the radio..replace both front tie rod stabilizers.i think thats what they are called,but they are bad again after a had 4 wheel alignment and still goes thru tires fast so i have replaced all 4 of them twice in the last 3 years.. what a money pit..i think Cadillac needs to pay us to keep these cars up and running since it is their car that has so many issues..
replace heater bypass vale leaking antifreeze, replace head casket leaking oil, replace oxygen sensor bank 1...yes it happen to me too..
bought the car , week later, engine light came on, replaced oil cooler and antifreeze still mixed with motor, currently replacing heAD GASKETS/ what a money pit
Oil mixes with antifreeze. Radiator has a leak, upper drivers side. Car leaks oil. Steams from under the hood only some times. Transmission slips when going into 3rd, so I have to drive it like a manual. Driving lights/headlights refuse to go out and drains the battery. Do I keep this car or scrap it. Body and interior is in good shape and it has such low miles.
oil leak's it seem that it's not circlulating cause I see a pluddle of oil inside the engine via the spark plug. then it shutting down
Valve gasket needs to be replaced, leaking oil. Replaced the radiator at 100k miles becuase of leakage.
Replaced valve cover gaskets, (also used gasket maker to be sure seal is in place). Took care of the leak. The oil cooler still needs to be changed. Burns oil like crazy causing smoke. Runs fine. Changed spark plugs as well due to the engine burning oil hotter.