Fleet managers have been successfully extending oil drain intervals for decades. Their success, in no small way, has been aided by continuing advances in technology -- lubricants, filters and the expanded availability of oil analysis. Those who have taken advantage of these advanced technologies have been rewarded with substantial cost savings over the years -- and can likely continue to do so. The state of California recently commissioned a study of oil drain intervals of its entire fleet of vehicles to determine if it could save money by extending intervals, and if so, how much. The study resulted in several findings. The role of the engine's oil filtering system is to remove contaminants from the oil before they generate wear on engine component surfaces. There are many excellent filtration products offered to the industry today with some claiming to allow for extended oil drain intervals. The primary indicators of an oil's condition will be silicon, viscosity, soot and total base number.
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