Need Some Suggestions on what people thing on brand and weight of oil for 5.9L?

Well I personally run Delvac, I was running Rotella! Since I started running Delvac I quit having to add between oil changes plus its only 9.87 at my local wally world!

I'm also in this catagory... But... I still look for a good quality name brane oil like Chevron Delo, Mobile One, Shell Rotella, etc. That meet the CI-4 or CJ-4 requirements.

Of course, but even the store brand oils meet those requirements. I'm not afraid of using store brand oils, it's just re-branded/brand name oil. Somewhere, once upon a time, I found a website that listed all the store brand oils and who REALLY made them. It was pretty interesting. Honestly, I've only changed the oil in my truck once since I've had it (Delo was on sale) but this theory has applied to everything I've ever owned...except my bike . My bike has a wet clutch with a couple known design flaws. Synthetics seem to band aid a few of the symptoms.