Air Filter FAQ's Oil Filter FAQ's AIR FILTER FAQ'S Q: How long have these air filters been around? A: K&N, Challenger's media supplier, has supplied air filters for race cars and other high performace engines for over 35 years. Q: Do I need to modify my aircraft to install the air filter? A: No. The filters are a direct replacement to your OEM filter. Q: Are your filters FAA approved? A: Yes. The filters are FAA-PMA approved and STC'd which requires a 337 at initial installation. Q: Will I save money on gas? A: Yes. Pilots report a .3 to .5 gallon per hour savings. At 100 hours that is a savings of up to 50 gallons of fuel. Q: How many times can I reclean the air filter? A: Filters can be cleaned up to 25 times or 2500 hours. Q: How do I know when to clean the air filter? A: Filter must be cleaned every calendar year, 100 hours or sooner in dusty conditions. Q: Can an engine get too much air flow? A: No. An engine can only take a fixed volume of air depending on it's size. The more restriction in the air intake system, the greater potential for power loss. Q: Will I see an increase in horsepower? A: Yes. A typical 2-4 percent increase, depending on the current amount of air restriction in the air intake system. Q: What about the AD for paper filters? A: Challenger filters are not subject to the paper filter AD. OIL FILTER FAQ'S Q: Will your cleanable oil filter fit my aircraft? A: Challenger cleanable oil filters are an exact fit for most aircraft piston engines. No special tools required. Please check application guide on our web site www.challengeraviation.com Click on the oil filter link. Q: Is it necessary to clean the Challenger oil filters at every oil change? A: Yes. The primary purpose of the oil filter is to remove contaminants, oil sludge and other combustive particles. We suggest having the old oil filter contents analyzed after every oil change. Q: Will oil temperature affect oil pressure? A: Yes. The thickness or viscosity of oil is directly affected by temperature. As the engine oil temperature increases there will be a proportional drop in oil pressure. Q: How does water in my oil react with your cleanable oil filter? A: Unlike paper disposable filters that are destroyed by water secretion, Challenger's oil filter use stainless steel mesh that is not affected by moisture. Q: Should I change my oil and oil filter when the oil turns black? A: Ashless dispersant oils are designed to get dirty so that the engine stays clean. Just how fast the oil turns black depends on many factors including condition of the engine, dirt load of oil filter, oil temperature, normal air mixture, type of fuel and frequency and duration of your flights. Change your oil filter on a calendar or engine time, not according to its color. Q: How will increased oil flow affect my engine? A: Increased oil flow reduces friction and removes more dirt and sludge that may be trapped inside the engine or engine sump. This is particularly important for engines that run hot, like turbo charged and high performance or aerobatic aircraft. If you have further questions about Challenger air or oil filters, please call Product Support at 1-937-387-6500.