2005 CTS V 5.7 V8 burning a lot of oil

[AaronGavin]

Hey everyone, I bought a 2005 V about a month and a half ago and I'm noticing it is chugging oil. 125k miles total on the car. I can't seem to get a very consistent answer when looking up the problem on google.

Basically wondering if anyone has any information based on this car specifically before I start digging into rings and seals. Also the PCV valve could need a cleaning..? Does my car even have one?

I'm a rookie to this car, any help appreciated.

[AaronGavin]

On 3/24/2020 at 10:40 AM, AaronGavin said:

Hey everyone, I bought a 2005 V about a month and a half ago and I'm noticing it is chugging oil. 125k miles total on the car. I can't seem to get a very consistent answer when looking up the problem on google.

Basically wondering if anyone has any information based on this car specifically before I start digging into rings and seals. Also the PCV valve could need a cleaning..? Does my car even have one?vidmate mobdro word counter

I'm a rookie to this car, any help appreciated.

I know it’s not a 5.3L but they had an TSB where you needed to replace the valve cover with an updated version. The baffles that are built into it for the PCV system wasn’t properly catching the oil. Get access to your throttle body, open the blade and look in your intake. If you notice large puddling of oil, it’s def your issue. Other wise I’d pull spark plugs, more specifically cylinder #3 and #4 . They were the most common ones to have bad rings so it should be obvious on the plug.

 

[BodybyFisher]

I wouldn't compare it to the 5.3L information you found.

This should be the 5.7L LS-6.    When you say chugging oil, how many miles are you getting before you need to add a quart?

Have you changed the oil and what brand, type and viscosity are you using?  

When you are on the highway and floor it, do you see blue smoke?

When you start the engine after is has sat for awhile do you see smoke out of the exhaust (valve seals)

How is your cooling system?, are you running normal temps?, or elevated?, because elevated temps will cause oil to evaporate.   Switch to an oil with a low volatility rate.   What are the coolant temps?

You are new to the car, the LS engine uses a bit of oil normally, and now you have 125K miles,

see this article, 

https://www.onallcylinders.com/2013/04/10/quick-tech-how-to-reduce-oil-consumption-in-gm-ls-engines/