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Message: [QUOTE="bootcamp, post: 1567746, member: 8002"] I can’t provide a reason for why they want 15/40 oil. Give them a call and have them explain their reasoning for that particular weight oil. I run Schaeffers OTR 5-40 in both of my trucks. With the HPOP system it’s gonna shear that 40 down to 30 really quick. That maybe the reason some run the 10-30. I’m sure someone else will chime in with better answers for you. Getting back in the truck now. [/QUOTE]

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