I never had a problem running my JLT catch cans on my Gen 1 or Gen 2. I don’t understand why guys try to spend hundreds of dollars on a catch can when it is a simple straightforward design. So yea, if you spent $300+ plus dollars for one, then you wasted your money. The JLT catch cans are sufficient and do their job with no warranty issues and/or throwing codes.
@goblues38 is partly wrong and partly right. All the excess oil and gas blow by doesn’t get burned up in an engine. How do I know? Tear apart any engine and you can clearly see what side of the engine the PCV was on and what side it wasn’t on as the blow by is evident. Does that mean that the excess oil/vapors will ruin your engine? Yes and no. If you don’t run top tier fuel with fuel additives, and quality oil with regular oil changes, then yes the blow by can accumulate over time and cause problems. But if you do all those things mentioned above, the likelihood of you having problems is slim. Moreover, most Raptor owners will NEVER keep their trucks long enough to have problems.
Vehicles nowadays can run 200k miles easily while not being maintained very well. Does that mean that you shouldn’t maintain a vehicle to the best of your abilities? No! Lol it amazes me some of my work fleet vehicles—currently have a 05 F150 XLT with 400k miles on the transmission (never been serviced). Does that mean that one shouldn’t do transmission flushes and change the tranny filters? No because someone who has regularly serviced their 05 F150 transmission is going to be in a lot better condition than what mine is in. In a similar way, catch cans will play a greater factor years down the road when the vehicle is older and out of warranty. How big that factor is is debatable. Nevertheless, they do work and alleviate oil/vapor build up. Tons of people on this forum have been using them for years with zero problems.