2023 Tuscon SEL
I chose this title as this is a big issue with many modern day cars. Though it's more prevalent with high performance vehicles like the 392 Challenger that I sold before buying my Tucson, it's an issue for every modern cars, especially turbos, and becomes a huge problem for cars that only have direct injection (DI). For example older Tucsons had only direct injection and Hyundai paid dearly to learn that lesson, as did many other manufacturers. DI makes for some great improvements in horsepower and gas mileage, but causes big problems with deposits on intake valves and combustion chambers. That's why I was so glad that my 2.5 Tucson has both DI and port injection. It's well known that port injectors are very effective at keeping intake valves clean. I would not have bought it if this were not the case. However, every modern car has a PCV system where the vapors from the crankcase are vented back into the intake manifold to be returned in the cylinders rather than vented to the atmosphere as they were before 1965 or so. In my Challenger, for example, there was a huge amount of oil in both the intake manifold and on the back side of my intake valves, even as soon as 16k miles. I installed a catch can to prevent this. I decided this week to take a look at the intake tract on my new Tucson to see how it was doing.