Engine Maintenance trumps a tough economy. Bypass oil filtration technology is one way to get there. For the past several years, ferry service and tugboat operators have had one eye on fuel costs and the other on the economy. But worry as they might, there’s not much, if anything, that operators can do to effect change to the economy or to reduce the price of fuel. What they can do, however, is effect change to reduce their company’s operating costs and that’s where proper engine maintenance can make a significant difference.