I'm trying to understand the benefits. My focus seems to use a small amount of Mobil 1 ep. Where it never used any Dino oil but besides that if an engine can go 300k + on Dino oil changed between 5,000-10,000 what makes synthetic any better? Ford says 10,000 intervals are acceptable on any oil meeting gf5 so in stating that what makes synthetic better for the average people? I understand it used to be able to go longer and last longer but is that really true anymore? And if it is can it go enough longer to justify the costs? Just me pondering things. As always pictures of engines and how clean or dirty they are is always cool.