What's your guys thoughs on Kendall oil. I've been talking about castrol syntec in my 6.2 ford but I was telling my father about this forum and how helpful you guys are. All he has ever ran in gas motors it's Kendall gt-1 full syn he tells me it's really great oil. I probably would doubt him because he runs gas motors 250,000 and never tears them down and they look new inside. So what's your alls thoughs?