I have a Purolator air filter on order for my Jeep, just because it was cheaper than the Wix. I almost went with the Fram because of their 40k mile promise. I was thinking I could get 20k to 25k out of it. Then I found out how shitty Fram's air filters are. The Purolator air filter is rated 10k-12k miles or one year, I'll leave it in for a year.