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ExxonMobil has introduced a new lineup of Mobil Delvac 1 synthetic heavy-duty diesel engine oils, that includes three products that meet either API CK-4 or FA-4 specifications.
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One specification is for later-model Eaton heavy-duty manual and automated transmissions, and another is for Eaton medium-duty Procision transmissions.
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For years, some fleets have turned to synthetic engine oils for easier starts in cold-weather climates and to help them extend oil drain intervals
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