Challenger Aviation Products Lifetime oil filter system for piston engine aircraft is machined from 6061-T6 aircraft billet aluminum. Inside the aluminum housing is a high flow, 22 micron, cleanable woven stainless-steel filter element. Large inlet and outlet passages provide for a maximum oil flow rate of 22 gallons per minute, double the flow of the largest "throw-away" oil filters. For more information visit www.challengeraviation.com.