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A major challenge facing the trucking industry as it copes with tighter emission standards from the Environmental Protection Agency is choosing the right type of oil to ensure that engines continue to perform to their maximum capability.

Crude oil futures hit a 19-month low price, closing at $54.02 a barrel on the New York Mercantile Exchange Wednesday following a Department of Energy report showing strong heating-oil inventories, Bloomberg reported.

Engine manufacturers and trucking officials said they recognize the need for onboard diagnostic systems to monitor the performance of emission-treatment systems because diesel engines are growing in complexity.