GM 3.6L LGZ - Intake Valve Deposits

[buster]

80k miles on engine (2020 V6 LGZ). Unknown oil.

GM uses an integrated oil separator. The best system still appears to be the port/DI mix.

https://gmauthority.com/blog/2019/01/gm-patents-innovative-new-integrated-oil-separator-assembly/

 

[BMWTurboDzl]

Looks fine especially at 80k miles.

 

[buster]

Looks fine especially at 80k miles.

I agree. Not bad at all. I'm asking him what oil he used out of curiosity.

 

[Shel_B]

I agree. Not bad at all. I'm asking him what oil he used out of curiosity.

How might the brand/type of oil affect intake valve deposits?

 

[buster]

How might the brand/type of oil affect intake valve deposits?

Lot of discussions on that. Do a quick search and you'll see.

 

[incognito_2u]

80k miles on engine (2020 V6 LGZ). Unknown oil.

GM uses an integrated oil separator.….

This “Intergrated oil separator“……..is this pretty much a Catch-can of sorts?

 

[tyman]

This “Intergrated oil separator“……..is this pretty much a Catch-can of sorts?

Basically, yes. Which also answers the age old statement of "if it's so good, manufacturers would put it in from the factory!"

Well, they are.....now.

 

[Thumper3]

This “Intergrated oil separator“……..is this pretty much a Catch-can of sorts?

It certainly sounds like one from their description, however it seems to state that it still vents to the intake (pesky emission laws) so it's more of an advanced PCV filter than a true catch can.

Looks fine especially at 80k miles.

I would be blasting that thing right away if it were me. I see some chunky buildup on the stems just waiting to bounce around. But yeah for 80k its not terrible.

 

[tcp71]

When Mazda put out their line of skyactiv engines in 2012, they included and integrated "oil separator" and those DI only engines seem to hold up fine without port injection. there are many ways to skin this cat.

 

[GMBoy]

I don't think those valves look good at all especially if there is a catch can type of system. I would have expected better. Those look like my 2008 CTS 3.6DI when I did intake gaskets...and it has no catch can system.

 

[WobblyElvis]

My son had a 2008 CTS with the DI 3.6 engine. It ran well to over 240,000 miles without any valve cleaning using cheap store brand synthetic.

 

[buster]

45k miles. 3.6L LGZ. Unknown oil/maintenance.

 

[repairman54]

My '16 Equinox 3.6 at 100k miles doing a plug change. Not bad enough to mess with. Catch can on it since 50k miles. Warren made full synth. oils and mostly Shell regular gas with PEA fuel cleaners at every OCI.

 

[Delta1]

Wow, those look filthy to me! (Coming from 06 port fuel injection land)

 

[AdmiralYoda]

Many of us used to (and still do) use Seafoam, Berryman B12, etc squirted into the throttle body opening or intake manifold somewhere to get that stuff to do some cleaning. The point then was to clean the intake manifold, intake valves and combustion chambers.

Anyone still do this on a GDI engine? Seems the only way to get some solvent down onto the valves since gasoline isn't keeping them clean anymore...

I have this engine and have been considering this.

 

[buster]

The buildup doesn't appear to cause any performance issues. Many hit over 200k on this engine with no problems. I'm curious what mine look like at 33k.