WTF - Italian Tune up? I got your tune up......RIGHT HERE!
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On a serious note...The Direct Injection engines can't really get cleaned out that way (WOT pull) because there is no PORT injection and that's the problem. The back side of the valves will always have carbon buildup because there is no fuel flowing over them. That's why in DI engines, even for longevity you should have an oil catch can.
There is a maintenance procedure from GM to clean the valves. There's a spray foam and a few hours of wait time and it will clean out your engine. A few mechanics say to run through the procedure a few times.
They are fun. Especially when I'm next to an unsuspecting Snack Pack on the parkway. I wish I had a picture of that guy's face when he got walked by a suburban lmao
Same. I think the torque converter is the only thing that has kept my trans from un-aliving itself..
The torque converters seem to be a problem point for the 6 and 8 speed transmissions. I believe you have a 10 speed so problems seem to be less common in that trans. I don't have any input on the new IRS on the newer models. I have the solid axle from the K2XX series and the G80 rear-end earned the name "G-bomb" for a reason.
I would think reasonable WOTs aren't an issue with the stock drivetrain. If you start driving it like Tony, Dou, or myself, you are probably in for upgrades in the future.