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If it's CK-4 rated it will work fine. CK-4 is the new CJ-4 which (I think) used to be CI-4, those would work fine as well. It's more peace of mind than anything, if the oil follows those standards then it's not going to blow up.

Having said that I use Rotella T6 5W40. Cause I like spending money and it makes me feel all fuzzy on the inside. It's a blend between PAO and hydrocracked. I think (hope?). As well as all the traditional additives.

Amsoil is more expensive and is synthesized off the remains of gold bars. But such is the price of PAO oils I guess.

Honestly you could role with the cheapest crap you find at walmart, and as long as it goes by one of those standards and you change at least every 5k miles I doubt the engine would degrade any quicker than using the spendy oils.
 
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