So what exactly are the differences between these? I drive a Ford F150 V6, with Mobil 1 5W30 changed every 5,000 miles. What would be the advantages of switching to GC? New to this board and don't understand all the technical jargon yet. Richie PS.. was at AuotZone today, they had Syntec from Germay, Belguim, and USA. The German is supposed to be the good stuff, right?