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Message: [QUOTE="JCart, post: 1529058, member: 1238"] Using Rotella in the Tan White Tan truck with a large capacity Donaldson DBL 7405 which is a fair bit larger capacity then stock filter. (Filter fits Cat engines and happens to spin right on stock location). 15-40W in summer and 10-30w winter and it seems to run smooth, filter seems to keep oil soot free longer too (not sure if that’s good or bad). Ran Delo 400 for years in my first couple 7.3 and noticed at 5000 kms (3000 miles) they’d run rough (like pulling up to a stop light). Tried Mobile full synthetic in the red truck, with an oil by pass system on it, seemed to work never ran A UOA on it though, cost in Canada to swap out 25 litre of full synthetic lost its appeal pretty quickly though..... so Rotella for now. j [/QUOTE]

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