: Losing Oil



Cryboy Crusher
04-16-13, 05:44 PM
Anybody else having problems losing/consuming oil? I have an 07' CTS with 85,000 miles and it wouldn't start this morning, turns out it was only because it was 2.5 quarts low on oil. WHAT?! Check engine light never came on or anything and never noticed any spots in the driveway. Took it to a local shop with a GREAT reputation and they said they couldn't find a leak anywhere. Not sure where to go from here.

tgar32
04-16-13, 10:35 PM
I have the same year CTS and the 3.6 is known for eating oil. I use Mobil 1 full synthetic and it helps.

Henders
01-15-14, 09:23 PM
The problem is that the CTS doesn't have a PCV valve, thus the oil is being sucked into the air intake (due to the power of the engine). If you take off the container that connects to the air intake, you'll find about a cup of oil in there. That oil gets burned through the system. This causes the O2 sensors to fail or worse the Cats to clog.

You need to constantly check your oil level. If it gets too low, it could cause the ignition coil # 6 to fail.

calif phil
01-15-14, 11:28 PM
2.5 qts low on oil will not keep engine from starting.

Submariner409
01-17-14, 10:53 AM
If you get into the CTS performance forums you'll find wars on whose "oil catch can" is better - one won't stop oil consumption but it will prevent most of it from getting into the cylinders.

EBSuspension
05-01-14, 08:16 PM
The problem is that the CTS doesn't have a PCV valve, thus the oil is being sucked into the air intake (due to the power of the engine). If you take off the container that connects to the air intake, you'll find about a cup of oil in there. That oil gets burned through the system. This causes the O2 sensors to fail or worse the Cats to clog. You need to constantly check your oil level. If it gets too low, it could cause the ignition coil # 6 to fail.

I capped the one at the air resonator and the two at the intake and ran a k&n style pod filter off of each valve cover with a bit of hose. I just replaced the timing chains and tensioners. My car had chain slap at cold start up that got worse and then the engine had all misfires and wouldn't idle. After inspection the chains I noticed the top chains weren't stretched much but the lower chain was and the tensioners were wore out. (Hence why I thought I had a tensioner bearing out due to the noise of the loose lower chain. The intake was full of oil/carbon due to the oil being pumped into it. After working on it after work for four days (the dealer wanted $1100 in labor alone) I got it all back together and now the motor is as smooth and as quiet as I've ever heard it. I bought it used and never knew what it sounded like new.the plugs looked original and after 109,000 miles the electrodes were wore to .065" gap. Stock is .045" I think I'm going to change my filter every 1000 miles or until I get less carbon buildup in the pleats since it's cheap and easy. I'll post my results on any less oil consumption after I get more time in it.