![]() In other words, 50% of D11 and D13 models are expected to go 1.2 million miles before an overhaul or similar major repair. “For instance, the Volvo D11 engine does carry a B50 rating of 1.2 million miles, which is the same as the Volvo D13.” “The B-rating system is useful in giving customers a good idea of engine life expectations for a specific engine family,” said John Moore, Volvo Trucks powertrain product marketing manager. B10 is the expected engine life in miles of operation, many times 1 million, before 10% of all of a specific model of engines in operation will require a major repair, overhaul or replacement, according to Navistar.
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