I'm In South Western PA, so pretty neutral climate, no major winters or scorching hot summers.. After looking at the API rating and temperature charts, I think I'm good. Only confusion is the manual I have says "Engine Oil: tier 2 or 3 - API CH grade or above Tier 4 API CJ grade above. Oil Viscosity: SAE 10W30, 10W40, 15W40."Religion, politics, and oil weight/brand.
Those are the things you should never talk about with anyone but your very closest friends. As it always leads to a fight.
With that being said, I have to respectfully disagree about switching motor oil brands. Thats an old wives tale. Just like switching from dino to synthetic or vice versa shouldn't be done. Unless its an old school engine without an oil filter, pick the right weight for your climate (see the manual) and buy any quality brand. You'll never go wrong. (And if the manual says use full synthetic, do that too.)
Now if you were talking about hydraulic fluid, I retract my statement as my knowledge there is limited.
Not too sure what tier I fall into but I figured the Rotella T5 is API rated for API CK-4, CJ-4, CI-4 or CH-4