Complications are never a good thing in trucking, especially when they involve routine maintenance tasks such as changing engine oil.  That’s one of the reasons lubricant makers struggled mightily over the years to craft engine oil blends that not only met strict chemical limits related to exhaust aftertreatment technology, but also to make them backward compatible so they could be used in new and old engines alike. Going forward with Proposed Category 11 (PC-11) oils, ...

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