Isuzu Commercial Truck of America Inc. announced that the B10 durability rating of its 4HK1-TC diesel engine has been increased to 375,000 miles. A “B10-life” rating is an industry-standard gauge provided by engine makers to help consumers determine the long-term durability of an engine. The number following the “B” indicates the percentage of an engine’s population that will require an overhaul before the indicated mileage. Isuzu 4KH1 Turbo Engine