Ditto on the synthetic oil. I've used Mobil 1 in my 2001 Ranger since the first oil change and have 114K on it. The used oil when changed looks better than new Dino oil. I have no leaks, on a good day get 24 MPG, and change the oil every 5000 miles. The stuff works. I use 5W-30.

The only word of caution that I've heard is to let the engine break in with Dino oil to seat the rings before switching to synthetic. I've heard of ring sealing issues when starting out with synthetic (it can work too well).