I use Royal Purple in mine. I was using Motorcraft 5w-20 until the warranty ran out then switched but still run 5w-20. As for a filter what ever you want I use Fram or K&N.
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04 GT Screaming Yellow
K&N cold air, 24# injectors, SCT tune, SLP X-Pipe, Spin Tech cat back, Hurst shifter, 3:55 gears, & a couple of Autometer gauges.
03 Aviator Ivory Pearl
Stock for now
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