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Hey everyone i’m new here I work at a car dealership and an older gentleman traded in a 2008 STS to get a 2018 CT6 and this STS is in amazing condition he was the only owner garage kept its whole life only 84k on it .... my questions are there any common problems with these cars? What are they? When do they tend to happen? And roughly how much is it to get fixed? Because i’m about to buy it for 4500 if everything checks out!!! Any info would be greatly appreciated thank you all
 

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Discussion Starter #3
Hey everyone i’m new here I work at a car dealership and an older gentleman traded in a 2008 STS to get a 2018 CT6 and this STS is in amazing condition he was the only owner garage kept its whole life only 84k on it .... my questions are there any common problems with these cars? What are they? When do they tend to happen? And roughly how much is it to get fixed? Because i’m about to buy it for 4500 if everything checks out!!! Any info would be greatly appreciated thank you all
3.6 or 4.6?
3.6 or 4.6?
3.6
 

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2005 STS V-8 1SF Magneride HUD/ACC, 2008 Escalade ESV 1SZ Y91 Luxury Edition
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1,474 Posts
Service dept should be able to tell you every service it's had if done at a GM dealer. If it's rust free underneath, drives nice, and has the options you want, buy it.
 

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2006 STS4 4.6L
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The 4.6 is preferable, in my opinion, but some guys have been driving their 3.6 for a long time with few issues.
 

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2006 V6 STS RWD
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The biggest potential problem is falling in love with the car. So long as it checks out mechanically, that is not a bad price, especially if you have access to special rates in your dealerships garage when it does come time to fix it.
 

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2008 STS Northstar RWD, 2000 Trans Am WS6 6 spd, 1968 LeMans convertible 6.6
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268 Posts
Decent price for a 3.6. Just know that that engine is hit or miss.
 

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2005 STS V-8 1SF Magneride HUD/ACC, 2008 Escalade ESV 1SZ Y91 Luxury Edition
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Ya Iv heard in your opinion what are the common issues?
Start typing GM 3.6 into google and it will auto-fill the most common issues. It's been that big of a deal for that long.
 

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2006 STS V8 1SF RWD
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6,487 Posts
The LY7 is notorious for drinking oil and timing chain issues, for starters.
The 2nd gen LLT isn't much better...

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2008 STS Northstar RWD, 2000 Trans Am WS6 6 spd, 1968 LeMans convertible 6.6
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Ya Iv heard in your opinion what are the common issues?
They can be oil drinkers, which causes timing chain issues. Then the chain tensioner won't recover from being starved of oil. We just had an 08 STS in the shop for running poorly. 3.6, it was 3.5 quarts low and misfiring, rattling badly. Owner got lucky, added oil and half the issues went away. No leaks under the engine anywhere.
 

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05 Stealth Gray CTS-V, 08 Light Platinum SRX V8, 05 White Diamond STS4 V8 1SG
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Is it PCV or rings? Or both?
 

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2008 STS
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I have been daily driving my 2008 STS since late 2011. Currently have 156k on the 3.6.

I had an ignition coil die at 90k, then again (same cylinder) at 148k. It does consume some oil, like a quart in between oil changes.
I replaced the passenger side motor mount due to vibration issues. I have the drivers side, just haven't found the time to get it in.
The alternator has been replaced, the power steering pump has been replaced, the water pump was replaced at like 45k miles due to a leak.

Inside the car I have replaced the blower motor twice, the blower motor resistor 3 times, the blend door actuator, and now it needs the other actuator replaced as I can hear it clicking and making noise. The driver side lumbar support stopped working. I opened it up and found the plastic gears were broken. I replaced them with ones I found at a junk yard and they lasted a couple weeks before breaking. Now it is disconnected.

I wouldn't consider anything I have done as major problems, just typical maintenance. I am actually in the market to get a full size SUV, but I can't justify spending the money because my STS still runs great!
 

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2006 STS4 4.6L
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Those plastic gears in the seat adjusters are so lame, it's like a very soft plastic/nylon which break way too easily. They aren't difficult to replace but metal would be far superior.
Motor mounts are a common replacement and I think they are supposed to much easier on the 3.6 vs the 4.6 but I still wouldn't trade it.
Blend doors become noisy after a while but mine aren't too bad, I don't use my climate control enough to be bothered by it anyhow.
Once the oil starts leaking into those spark plug wells it will eventually kill the coils, although there could certainly be other causes for it.
 

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2008 STS
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Those plastic gears in the seat adjusters are so lame, it's like a very soft plastic/nylon which break way too easily. They aren't difficult to replace but metal would be far superior.
Motor mounts are a common replacement and I think they are supposed to much easier on the 3.6 vs the 4.6 but I still wouldn't trade it.
Blend doors become noisy after a while but mine aren't too bad, I don't use my climate control enough to be bothered by it anyhow.
Once the oil starts leaking into those spark plug wells it will eventually kill the coils, although there could certainly be other causes for it.
I actually 3D printed some new gears and got them to last a few days longer than the junk yard replacements. If I get bored, I will laser cut some out of steel and try them out.

The motor mounts weren't too bad. I got the passenger side out/in without any issues. The drivers side was a little bit more of a pain. Most of the online write ups I found (for 3.6 CTS) suggested removing the catalytic converters to free up space but those are also a pain to remove. I attempted to do it without removing it and was almost successful until I became frustrated and it was getting dark out so I just put it back together.

After I replaced the ignition coil for a second time, I went a head and did the spark plugs at the same time and did notice oil on one of the other plugs. It's probably time to change out the valve cover gaskets.
 
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