Last post on May 16, 2013 at 4:36 PM
You are in the Cadillac CTS/CTS-V
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Cadillac CTS, Engine, Sedan
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#373 of 659 Re: 2008 CTS Engine OIl Consumption [michael68]
Nov 11, 2011 (5:22 pm)
I really wouldn't recommend it! I just don't want you to have to go through the same problems I had to go through with my 04 CTS! Not just me either keep reading the reviews! We have all had the same problems! I purchased the car in 2007 and in 2011 the engine went. So between that 4 years I probably put an EXTRA $7000.00 in Repairs! So my $19,000.00 04 Just jumped up to a $26,000.00 used Cadillac CTS! I really am trying to save you the trouble! Good Luck with your decision!
#374 of 659 Re: 2008 CTS Engine OIl Consumption [4u2no]
Nov 14, 2011 (12:16 pm)
Thank you all for your posts; I am documenting the information in the thread for further consideration by GM.
GM Customer Service
#378 of 659 Engine Problems
Nov 28, 2011 (8:19 pm)
Although it is true the 3.6 has timing chain issues which bring on a host of other problems there is a Service Bulletin from Caddilac that says they will replace the defective part. This is something that needs to be done prior to failure. Another thing is I am just amazed at the lack of common sense when it comes to owner responsibility with a car. Synthetic oil does not break down however it does get dirty and under no circumstances should anyone wait 10000 miles to change the oil let alone 6k. Constant filter changes is the only way you can extend synthetic oil life but being I have been a certified mechanic for 30+ years it's not recommended. I change my oil every 3k-5k miles depending on weather and driving conditions. Also I would not recommend 0w-30 or 5w-30 in any car except in very cold driving conditions. It is recommended by manufacturing engineers to increase gas mileage due to less friction from viscosity but at the risk of less protection. I will never use anything less than 10w-30 in my cars under 50k miles and 10w-40 after 50k. There is not enough protection from low viscosity oil in hot operating temperatures like hot summers. Another thing, check your darn fluids at least once a month and do not rely on sensors. Also some engines will break down from being even one quart low on oil. There is a reason the 3.6 takes 8 quarts. One is there needs to be extra oil for the additional moving parts and the oil galleys it takes to lubricate them. Some engines keep a lot of oil in the top of the engine and the oil drain holes are small so if you are one or two quarts low the oil pan has little oil to lubricate the crank, pistons and associated bearings causing failure. The oil pick up tube is sucking in air.
There are problems with many new engines due to the complexity because it's not easy to get high performance along with good gas mileage the two just don't go together. There are two things a responsible car owner should do. 1) go online or to the dealer to check for Technical Service Bulletins for your specific vehicle and get the repairs or replacements. 2) Check all fluids at least once a month especially before and after a long trip. It is not unusual for an enging to burn a pint of oil in 3k miles. To reiterate an important point change the oil no more than 5k miles no matter what the dealer says or pay the consequences. Remember they want your car to break down it puts money in their pocket.
#379 of 659 Re: Engine Problems [marso13]
Nov 28, 2011 (10:02 pm)
i agree with you on some points but GM designed the motor to hold 8 Qts and they designed the oil returns so if the oil does not return fast enough that would be a design flaw, i have 2 04 3.6 cts's that consume 1 Qt of oil per 1500 miles. I still do not understand where the oil goes because it does not smoke at the tail pipes or should i say not for that kind of oil usage. I am a retired auto shop owner of 25 years, and still do not understand why so many of the 3.6 motors use so much oil, there has to be some underlying problem with the motor design, I have read where some people modify the pcv system, if anyone knows what to do to help the oil consumption i will consider trying them THANKS K9will
#380 of 659 Re: Engine Problems [k9will2]
Nov 29, 2011 (10:16 am)
I do not understand how Cadillac, GM's premium brand, can have so many engine problems. My dad has a 2001 Cadillac Deville with 68,000 miles. It uses a quart every 700 miles, but it does not smoke out the tailpipe. I talked with my dealer's service rep and he told me that this was a common problem with the Northstar from 1999 through 2004. How can GM let problems continue like that?
I also agree with the other writer. I change my oil every 5,000 miles. My dealer recommended every 6,000. I had always heard that synthetic did not break down, but I had never thought about the dirty part. I talked with one Cadillac service department and he said that people, who go by the oil meter, come with the car almost out of oil. Unbelievable!
#381 of 659 Re: Engine Problems [marso13]
Nov 29, 2011 (10:31 am)
Let's get at least one thing perfectly clear, the problem 99% of these people are having is because of an engine defect not lack of common sense . There is not amy company out there that designs an engine to burn 4 quarts of oil in a trip of 100 miles. I don't care what oil you put in these engines that is the problem in a nut shell.
#382 of 659 Re: Engine Problems [k9will2]
Nov 29, 2011 (11:04 am)
That is one point I forgot to mention is the PCV system could be sucking up oil mist more than usual and it is being burned at such a slow rate it won't be noticed but if this is the case then the rings are not sealing properly allowing too much blow by. As for the oil disapearing in you engine have you removed a valve cover when it is low to see if it is being retained on the head? The Toyota/Lexus 3.0 has this problem with small drain back holes also and if there is any sludge it will stay up there. The drain back holes are designed to be small to keep oil in the cam area for lubrication of the multiple moving parts that's why 8 quarts is needed it's not neccessarily a design flaw. It may be the 3.6 has rings that either don't seal properly, weren't broken in properly or wear quickly due to inferior material. The oil is going somewhere so if it isn't pooling then it is being burned. If so the pipes, catalytic converter and muffler should all show residue.