I really think how you run the truck is dependent on using a synthetic. If you run the truck for 5 minutes to work and shut it off, there is still moisture in your engine, it won't get warm enough day to day to evaporate it out of the oil. For that I'd use the syn blend like Stone said and change it every 3000 miles. If you run it for at least 25+ minutes one way to work you'll get most of the moisture out of it, so you can keep your oil longer, using a full synthetic with a longer drain interval, like 7500 miles or more.
1996 F-350 4wd 7.3 5 speed Crew cab
1997 F-350 4wd 7.3 5 speed Regular cab Stage 1s
2002 Ranger Ext. Cab FX4
Originally Posted by Fx4wannabe01
I'm talking about the basic, standard *****. Fx4 ***** are completely different and big.