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Discussion Starter #1
With these new gen cars coming into their second full year I expect that there are some cars out there that are starting to see some higher mileage. How are they holding up?
 

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09 CTS 3.6 Metallic Red, 11 Subaru Outback, 04 Malibu Maxx
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Mine is an 09 MY...six months old....just about ready to roll over 13K miles....with the exception of the rear break squeal, which was fixed by the dealer....not one problem, squeak, vibration or unwanted sound so far..

Im sure there are many more that are older with more miles.....but fine here so far.....
 

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2008 Black/Ebony CTS-4, Other(s): 2009 Wicked Solstice
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I've had mine for over 16 months and have 20,000 miles on it. for a variety of reasons I didn't drive it much the last few months so it should be more like 25k but it works in my favor since I'm way ahead of pace for the lease miles. anyhoo the only real problem I've had is with the hfv6. there are a number of issues that have to do with crankshaft and camshaft timing sensors and their sensitivity. these show up as reluctor problems, the infamous "shim" issue - too much camshaft endplay in the heads - and I believe timing chain stretch as well. I would not necessarily ding the CTS for this since it is a corporate motor based on the old chevy v6 redesigned by Holden, and it is used in many gm cars and crossovers. the problem with mine occurred at ~12k miles. as far as the car itself goes, I think the designers may have overextended themselves with the large vista sunroof. it is heavy and takes up a lot of roof structure, with the result of being sensitive to alignment and causing noise - both wind noise and creaking. other than that I'm doing fine.
rg
 

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We have about 16 months on our 2008 CTS. At almost 27k miles all is doing fine, no squeaks or other problems. We did have a problem with the rear door locks shortly after we took delivery but the dealer easily fixed that. We also went through a period of squeaky brakes for several months but they are quiet now. We live on a gravel road so I'm not sure yet if there's a relation to dust level on our road and squeaky brakes. I'll see if they get noisier as we get into a drier season.
 

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Discussion Starter #5
Ronster so you have had problems with the engine. That s cks, I have had some nonsense problems, ie door latch problems in cold and an annoying creak from the sunroof molding, but no real problems. I wonder what percent of the cars have engine problems and why some cars timing belts stretch while others have not. Maybe with mileage we will all be facing internal repairs. I certainly hope not.
 

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2008 Black/Ebony CTS-4, Other(s): 2009 Wicked Solstice
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the problem as I see it with the hfv6 is that there is a very small percentage that have issues, but with millions of these motors on the road someone is going to get bit on occasion. the timing chain stretch issue actually dates from a few years ago and I think gm has been working to reduce these and other occurrences. then it becomes separate concerns - will you have problems with the car (most likely no), and how well can a dealer or other service dep't take care of it. my experience with the reluctor issue is that it is quite rare, and each time it happens the factory gets more information as to how it manifests itself and what fixes are effective.
rg
 

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Discussion Starter #7
Thanks, You are probably right.

By the way when I saw reluctor in your prior post I thought it was a typo. What is a reluctor?
 

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2008 Black/Ebony CTS-4, Other(s): 2009 Wicked Solstice
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Thanks, You are probably right.

By the way when I saw reluctor in your prior post I thought it was a typo. What is a reluctor?
the hfv6 has 4 overhead cams, 2 for intakes and 2 for exhausts. these are timed for actual intake and exhaust events relative to piston position and rpm. the ecm needs to know exactly where the crankshaft and all 4 camshafts are at all times (plus how fast the crankshaft is rotating) as feedback for the vvt functions. these shafts are usually either steel or iron, and typically forged. the sensors can be of various types and technologies, and holden/gm designers decided to use a magnetic system that uses variable reluctance to trigger a sensor. there are relatively soft iron toothed rings pressed on to the crank and cam shafts to activate magnetic sensors so the computer receives electrical pulses related to the individual shaft positions. one problem is that the soft iron reluctor ring can slip on the shaft. also if the camshaft is allowed to travel end-to-end too much the sensor will get a weaker signal. the ecm runs continuous checks among the 5 signals to make sure the levels and timings are valid. if any of the cam drive chains stretches more than some practical limit the ecm will complain about the timing events. usually it ends up being a singular event but the new ecms are required to catch possible cylinder misfire events for pollution control so this type of occurrence can be caught as a misfire code. then the check engine light is set, even though the motor continues to run normally.
 

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2017 XT5 and 2014 Corvette
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I may have the oldest Gen II CTS on the forum. We brought it home on Aug 25, 2007. That makes it almost 19 months old. However, it is not a high mileage car, with only 14,146 miles. Only minor problems were an exhaust rattle and the Nav software update that were both quickly resolved/handled by the dealer.
 

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I have 35k on my 08 base. I only had to replace the arm that holds the hood up. Other than that, everything is good.
 

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09 CTS 3.6 Metallic Red, 11 Subaru Outback, 04 Malibu Maxx
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It looks like 54K is the highest so far. At what point did people with high miles need brake work or tires?
that will probably vary based on driving style and traffic conditions....mine isnt a daily driver and is mostly interstate miles....thus my tires still look as good as the day I drove them off the lot at 13K...

I usually get 45-60K out of a set of tires and usually 50-60K out of a set of brakes.....coming from an 06 Solstice (38K on it and OEM Brakes and tires still), 04 Malibu Maxx (142K and second set of aftermarket brakes, and third set of tires)
 
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