GDI Oil can sperators

[Elk Hunter 04]

I've just purchased a 2020 Trail Boss with 5.3 and 10 speed auto. I've seen in 2 different GM forums reference to the need of oil can separators on GDI engines. Is there a GM tech that can advise of the actual need and effectiveness of this? 

I'm in California and the JT 3.0 is not CARB approved and not available in California. Isn't this an add on that would void your engine warranty. I've had excellent performance, trouble free experience with the 5.3 v8 on my other trucks.

Can someone clear the air on this subject?

[Jsdirt]

Since there's no fuel washing over the intake valves like in the '"old days" (lol), they will coke up just with normal run time. Add a little oil to that, and I'd imagine you'll need a cleaning much sooner. The cleanings aren't cheap I hear. I know the solution is very pricey, plus labor, so I'd imagine that will add up every 15k miles or however often you need it. I say the catch can, can only help. Can't see how that could void a warranty in any way ... but, this is GM we're talking about, so better do some more research there.

 

Another solution is to stuff that pedal to the rug any chance you get. Blow the carbon out, like we used to do. Work it. But no matter what you do, those valves will coke up eventually, unless GM finally changed something, like an upstream injector like Toyota has been doing. I wouldn't hold my breath on that one. From the company that's built failure prone AFM/DFM systems for about 30 years (the first 4100 Cadillac systems were every bit junk as the 2007-up systems are), and continues to sell trucks that blow out cab corners, rocker panels, and fenders for 40+  years - don't expect them to fix anything ... except higher price tags to the window.

[Doug_Scott]

I doubt an oil separation can would even require CARB approval.  It does not impact engine running or emissions.  CARB approvals very likely aren't free, and perhaps no one is willing to pay for something that will simply take too long to recover the expense.