I'm trying to get the IVD situation figured out and I'm mostly confused when it comes to oil choice and interval. My vehicle is a 2019 Kia Sorento with the 3.3 V6. Naturally aspirated direct injection. I'm currently running Shell RGT 5W-30. 5W-30 is what the manual calls for. Kia calls for 3750 mile oil change under severe conditions and 7500 change for normal conditions. I'm not driving much currently because of the virus, but would normally do about 2/3 of my driving in short trip, stop and go driving. The other third is highway mileage. So I was planning to do changes around 5000 miles based on the amount of short trip driving. At this time I'm not planning to add a catch can. But I'm thinking that maybe even shorter OCIs would be beneficial with respect to IVD. My thinking is that the dirtier the oil that is in the blow-by, the worse the IVD would be. Cleaner oil getting blown-by would be less of a problem. Does that make sense or no? Is this a faulty assumption? I see the dirty intake valves in the YouTube videos and it makes me wonder if shorter OCIs would help. Would the caked up valves still look the same with say, 3000 mile OCIs? What about changing PCV more often? Any benefit to that? I think the RGT is in the thicker end of the viscosity range (which I think would be good) but don't know about all the other factors like NOACK and SAPS and all the other numbers that I don't quite understand. I have four more changes worth of RGT on hand. Any insight from those that know will be appreciated.