This is one of the best descriptions of the reason for the catch can I’ve ever found. And it’s hard to LOGICALLY argue against anything he says. If you can, please do
It seems like your favorite argument is “if it needed it, Nissan would’ve made it standard.” I can’t even fathom why you’d think ANY manufacturer would give you something that won’t matter until after 100,000 miles or more. They’re not going to eat the cost of the parts alone, not to even mention the R&D cost to implement and certify that part to use across the lineup.
I get you don’t think they’re worthwhile (you actually think they’re worthless) and honestly, no matter how many times you make your arguments against them, you’re not changing anyone’s mind. And no one really thinks they are going to change your mind.
However in this idiot economy we’re currently in, the catch can cost less than a tank of gas and a dinner for 4 at Taco Bell. I’ll happily spend that one time for many years of piece of mind for a truck I plan on keeping until I can’t repair it anymore.
And there may have been one or two people who said the world would end without the can in the other thread, but the overwhelming majority just said it helps save unnecessary expense cleaning the valves later and lessened performance. That’s a far cry from “the sky is falling, my engine is gonna explode!”