This is for a 2017 2.3 EcoBoost Explorer. Given the choice would you choose a Purolater One Synthetic air filter with up to 99% efficiency or the standard Motorcraft air filter. I have no idea what the efficiency of the Motorcraft air filter is. The Pur One is $1 more than the Motorcraft, so cost is not an issue. I tend to not change the air filter frequently or even in the 30,000 mile recommendation it seems, currently at 46,000 miles on the Motorcraft air filter, my bad . Though I change all the vehicle fluids more frequently than specified, go figure.