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    Oil change interval for fleet

    Hello Gang! I run a small fleet of Ford E-series wheelchair vans (90% city, 9.5% highway, 0.5% idle)They are on OEM recomended 5W20 Motorcraft with Motorcraft filters. Schedule says 5k interval heavy duty use, 7.5K "normal" use. I think I should consider my application "heavy-duty" Question -...