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Oil grade 2001 cat engines

15W40 that specifies to CJ-4 or CK-4 or ECF-3
So Shell Rotella, Mobile Delvac, Vavoline Premium Blue, in short most any Diesel rated oil
 
Can I use the SAE 30 wt. I saw somewhere else that thirty weight should be used because of deposits on the turbos, and after coolers, i'm just trying to confirm, I wanna go with the best oil for my boat. Thank you in advance
 
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