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Message: [QUOTE="dasboot, post: 198256, member: 2600"] We use rottela at work and it seams to work real well for the big Cummins, Cat's and Navistar engines in the motorhome. I used reg 15w40 Rottela T6 in my truck last winter and the truck ran fine, but it made the exhaust smell bad and the cold starts sucked last year. Thank goodness for the block heater. I changed to Delo 400LE 15w40 and the exhaust wasn't as stinky, cold morning starts are smoother and I think the truck ran smoother. [/QUOTE]

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