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From this forum and the GMC Acadia forum (Acadia uses same 3.6 liter engine as the CTS), unfortunately GM is of little help unless the engine is still under the powertrain warranty. Since your vehicle is a 2006, I assume it is not under warranty. This engine has significant problems with its timing chains (3 in total), and when you're losing oil it means there is insufficient lubrication of the timing chains and the rest of the engine. As a result the chains tend to stretch leading to major engine damage. If I were you I would top up the oil and trade it in as soon as possible. Good luck.
I have the same problem with my 06- CTS Eating Oil like every 2-months I have to add 2-Quarts
Has anyone else had a problem with the 2011 CTS completely shutting off on them like the recent problems with the Cobalt? I have and posted this in March 2012 here on this site. I had the CTS in with two Cadillac dealerships (Ken Dixon Cadillac (now Waldorf Cadillac and Capitol Cadillac) and neither could replicate the problem and the computer showed no errors. The car has shut off completely on me twice pulling into traffic...how I haven't been injured or killed is beyond me. Both dealerships have just handed the car back to me saying they can't replicate the problem. GM Customer Service (via live chat) told me the same thing....if we can't replicate it we can't fix it. How many Cobalt owners did they tell that to before enough deaths caused them to investigate? Because the "premium parts" on my CTS are not on the recall list you won't look into it? I would love to have a reply from the GM Customer Service Reps that monitor this site.
We are sorry to hear that you are experiencing these concerns with your 2011 Cadillac CTS. Although we may not be able to provide any technical advice, we'd be happy to document your concerns or reach out to your dealership. If you'd like our assistance please send us an email to firstname.lastname@example.org with your VIN. We look forward to hearing from you.
GM Customer Care
Very disappointed. I purchased an 07 CTS 2.8L in 2013. Only had 90,000 kms on so I thought low K's for a 6 year old car. 1 week after driving I hear a clunk in the front end every time I go over small bump or even a crack in the road. Fought with dealer to have it fixed under warranty. Fought all day to finally have them say they thought the front struts were shot. Kept car overnight, replaced both front struts and clunking sound was gone. Then key fob stopped working 2 months after purchase, not under warranty, replacement $200.00. 6 mths after purchase awful screeching, turns out to be timing belt or chain. Reason, car is down 3 liters of oil. Back to dealer. Service guy says oh yeah these cars are famous for "eating oil". It's not leaking. It's just gone. I have had to add a liter of oil roughly every 1500 km for the past year, because the other solution offered was rebuild or replace engine. 24 months after purchase, catalytic converter done. $1500.00 1 week later transmission starts acting up but before I have a chance to bring to my mechanic tomorrow the car overheats and loses all power on the QEW highway. It is now sitting at Canadian Tire awaiting a service tech to tell me whats wrong this time. Hunk of junk. 4th GM vehicle in 12 years. First 3 were decent to great. The cadillac is the WORST car I've ever owned, would never recommend. Oh and the $200.00 key fob lasted 6 months and stopped working. Dealer accused me of dropping it in water. Said sorry, no warranty. What a [non-permissible content removed] move!!Sorry for your troubles...I traded in a new 2015 mustang convertible with 5k miles because it had a vibration Ford couldn't fix...Ford was horrible to deal with. Instead of dealing with the lemon law I traded it in on a 2012 cts4 coupe. Loved it..immaculate. However I checked the oil after a month and it was down a quart...filled it and then it was down 2 quarts about 2 weeks later. Barely 4 years old with 60k miles...And the car was giving me the sweats. I rolled negative equity to get away from the Ford, into an even worse cadillac. I've always driven nice Toyotas...never any problems even at 156k on my Solara convertible. As soon as I saw the huge loss in a short period of time, went to Nissan and got out of the negative equity on a 3 year lease...I will never consider any American cars again....especially Ford or Cadillac. Bye bye!
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