Im getting ready to replace my o2's and dont want to pay the $140 for the set. I noticed the NGK's (NTK) would only run $80 a set... Now I know you are only suppose to use motorcraft sensors, but I also know that NGK is the supplier for Ford; do you think these would be OK to use???
They're fine. You have to realize that here, for the most part, you're dealing with anal retentive people who spend hours debating about what battery, oil, wire, spark plugs, etc, are the best. In a world where everyone follows only exactly whats best for everything, you'd probably use only OEM replacements. Luckily for other companies, that world doesn't exist.