At 24,000 mi. I switched my wife's 03 Forester to Mobile 1 and the Napa Gold (same as the WIX) oil filter, which is one of the best oil filters on the market. I ran the oil and filter for 10,000 mi. and last fall changed the oil and oil filter, this time switching to Mobile 1 EP, and installed a new Napa Gold filter. After 10,000 mi. on the Mobile 1 EP I'm going to change the oil and oil filter and have Blackstone Labs do a used oil analysis on the used oil.
I drive an 03 Ford Ranger with the 3.0 liter V6. This is the "Vulcan" engine that's been around for a long time, not the newer Ford Duratec 3.0 liter V6. At 9,000 mi. I switched it to Mobile 1 and a Purolator Pure One oil filter (also one of the best oil filters on the market). Last fall, after 10,000 mi. on the Mobil 1, I changed the oil, again using Mobile 1 and a Pure One filter. After 10,000 mi. I'm going to have Blackstone Labs do a used oil analysis and will switch over to Mobile 1 EP.
I've had no problem with either vehicle as a result of using the Mobile 1 and haven't had to add oil to either vehicle between changes.
After the 10,000 mi. oil change of the Mobile 1 in each vehicle I cut the used filter open and inspected it. Both were in excellent condition and still doing their job.