The fleet agreed to the test to improve cold-weather starting and fuel efficiency, and anticipated a 0.5% fuel consumption benefit. An oil supplier approached the fleet to test 10W-30 engine oil. The carrier had been using a 15W-40 mineral-based oil. The fleet vehicles averaged 115,000 annual miles. Both fleets have routes in the lower 48 states and Canada, and the age of the vehicles in both fleets was two years. To make its case regarding the benefits of low viscosity oils, NACFE reports on two studies with national carriers. However, new emissions regulations and the advent of new oil categories may increase the adoption rate. Yet while 40% of the largest, most efficiency-conscious fleets have adopted these engine oils, the adoption rates for the industry as a whole remain at only about 20%. Since 2003, fleets have been ramping up investment in lower-viscosity lubricants.
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