Sorry to burst your bubble but Filtran is the best filter to use with the 5HP24 transmission. Cheaper filters often cause the transmission to whine. Filtran is what comes in the 5HP24 from the factory, and that's the only filter I'll ever use as a replacement. I've used Filtran filters on every 5HP24 fluid + filter change so far with great success. My 540i Touring has 184k miles on the original transmission and it's still shifting pretty well thanks to a well-maintained transmission.

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2003 X5 4.6 | 2000 540i Touring

Formerly owned:
2004 Range Rover | 2000 M5 | 2000 540i/6
1995 750il | 2003 Mercedes S500 | 2003 540i/6