I allways use the synthetic. I have heard that it can increase the life of your engine, and for what I spend on oil changes and how often, it seems like a worthwhile investment to me. If I can squeeze another 50k out of my engine because I used synthetic oil, than I have paid for my oil changes tenfold I figure. Who knows, maybe I'll throw a rod before then, but then if I used regular oil........... would I have thrown it earlier?????? Only the shadow knows.....knows.... knows.............. (Yes I am a dork.)
Welcome and enjoy the site/info/help/ and often stupidity of your fellow mustangers....

__________________
2005 Torch red, predator 93 octane, K&N filter, Pypes true duals, Eibach Pro-kit springs,4.10 posi 8.8 rear end. GT fanblades with Eagle F1's, GT500 rear bumper/spoiler/front splitter