My '90 SR5 V6 used Mobil1 and Fram filter (shhhhh! I know, garbage, but read on...) with oil/filter changes at 8k-10k miles and I sold it with 205,000 miles on it. My friend has 350,000 on it and he says she's still NOT burning or using oil.
I use Mobil1 in my '00 SR5 and Fram filters (Mobil1 filters lately) with oil/filter changes at 8k-10k miles , has 152,000 miles and burns or uses no oil.
My new '08 Sport will get Mobil1 oil and filters with oil/filter changes at 8k-10k miles.
Notice a trend here?
Oops, my '07 Mustang GT uses Amsoil oil and filters...