I had to take them in for maintenance. I'm in sales and the vehicles are 100% maintained by myself, but the maintenance is paid for by the fleet company. I would only start to think about changing the oil when the oil life went to 0% and I carried close to 300lbs of equipment in them all the time in the back. I treated them horribly.Assuming the fleet vehicles you were using were also fleet maintained, fleet vehicles are usually better maintained than the typical everyday personal vehicle which likely added to the fleet vehicles reliability.
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