Vehicles equipped with the 4.6L engine may develop excessive oil consumption. Please be advised that under optimum driving conditions, using one quart of oil every 2000 miles is acceptable. This Cadillac standard applies to vehicles with less that 50,000 miles. Our technicians tell us that if you experience excessive oil consumption it may be caused by built up on the piston rings which restricts movement, preventing them from wiping all the oil from the cylinder walls. Oil left behind is then burned during the combustion process. There is a special ring cleaning procedure which can help this situation. The GM service bulletin number is #02-06-01-009C.
Excessive Engine Oil Consumption on Cadillac Seville STS
Average mileage: 111,867 (30,000–213,000)
32 people reported this problem
13 people shared problem details
1999 Cadillac Seville STS86,350Visitor
Uses 1 quart every 900 miles. I just bought the car with 83k. Took it on a 2500 mile trip and needed 3 quarts. I tried the flooring it cleaning method but didn't seem to do the doing the trick. No leaks noted in or under the car next try the piston clean as noted.
cas sucks oil smakes bad and dealer did nothing this car burned oil sene new and leaked also run hot now needs head gaskets due to gms fraud on the public we need to sue for this my car has 108k and itsalways ran hot used oil and now needs new engine caue of gms scam they need to be sued for this fraud
2003 Cadillac Seville STS98,100Visitor
Cadillac Seville STS was almost out of oil ("Check Oil Level" status message came on) after a 380 mile highway drive. Oddly, there do not appear to be signs of significant oil leakage under the car. Other than this the car runs perfectly. Wondering what "normal" oil consumption is for this car (considering its price and luxury status).
1999 Cadillac Seville STS206,000Visitor
I've been burning 1 qt/tank of gas for the past 100,000 miles. I can now smoke out anyone behind me if I stomp the gas a bit.
2000 Cadillac Seville STS35,000Visitor
GM replaced all pistons with teflon coated pistons under warranty
2003 Cadillac Seville STS206,000Visitor
I need to add oil about every 1,000 miles. Oil does not leak onto dive way surface. No repairs have been made to this problem.
1999 Cadillac Seville STS73,000Visitor
I bought a 1999 Cadillac STS about a year ago from a friend. It had low miles (67,000) and good price. However, my mechanic told me when I went in that it was "out of oil". No leaks under the oil pan. He said it was a valve, burning oil. Since there are a whopping 32 valves to cause troubles, that's no surprise. That was about 5 months ago. It has started smoking a bit, even with a short drive of 10 miles. I can only guess what it will be like in a few months! A second shop said there was a "valve problem", and a new engine was the answer. Well, it was not MY answer, since I live on Social Security! I'm now attempting the miraculous: trying to find a shop that's honest, fair and reasonable - in that order. Or, someone who works in a shop and also moon lights on the side. In the meantime, both garages said, "Just keep putting oil in it". That doesn't seem like a good long-term solution. If anyone knows what to do, or someone who is savvy, a reply would be greatly appreciated. Stranded in Placerville in luxury!
2003 Cadillac Seville STS77,000Visitor
Excessive oil quart every two weeks
2001 Cadillac Seville STS213,000Visitor
Occasional full throttles helps cure this problem almost all the way, once a week should be good.
1999 Cadillac Seville STS159,000Visitor
my cadi seems to use "ALOT" of oil, although we haven't noticed it coming out from exhaust, or excessive leaking.
Dealer indicated within specs. Just learned of the cleaning procedure prior to this website, thinking of trying. Has anybody else had success with this service??
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