Quote:
Originally Posted by Mantilgh
Because that oil vapor condenses in the in the intake system and coats it. It can build up in the intake runners and on the back of the valves, more so on direct injection engines. It can coat and cause issues with the throttle body if it’s plumed in before it. The vaporized oil mixture is also probably not great for the combustion process, because it’s messing with the air/fuel ratios
The system is there for emissions/EPA.
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Honestly, most of the folks with catch-cans are OCD control freaks... which describes most car guys... lol. But still, it's not needed, bro.
NEITHER of the million-mile Tundras had a catch can.
Yes a little oil circulates, but not stuff that looks like what slowly congeals in that catch can. We're talking a tiny vapor that naturally lubricates the valves, intake plenum, etc. And the valves get washed by the gas detergents and heat.
Last, the throttle body is no big deal. Every 100k miles you just pop it off, wipe it with some cleaner, and reassemble. Not anything to be concerned about.
Now, direct injection engines? Eh, maybe. But tbh, that's the whole other end of the spectrum -- the catch cans DON'T DO ENOUGH to save the valves from build-up. It happens anyways.
Best bet is to do the below:
-ride it out with your port injection engine, and skip getting a direct-injected engine until everything is electric.
-if you really have to get a direct-injection engine, pray the next 4runner uses dual-injection like the Toyota 3.5L uses now, so that you get the cleaning effect of port injection and the better power of direct.
