First a caveat to my response. I haven't yet changed the oil using the trap door. Since I needed to change my oil when I installed the undershroud I did the oil change once I removed the OEM plastic tray and before I installed the new undershroud.
That being said it appears that the trap door lines up perfectly with the oil drain plug and the oil filter. I see no reason why you should be able to change both the oil and the filter using the trap door. I've heard that changing the oil is easier if you also use something to hold the trap door open against the bottom of the undershroud so that it doesn't get in the way, but I haven't tried it.
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2003 Daytona Blue 350Z Touring/Nismo
2009 Platinum Graphite 370Z Touring/Sport (Sold)
2009 BMW 135i/Dinan Stage 2 software upgrade/M3 suspension piecies/Koni Sports/ETS FMIC/Alufelgen SF-71 wheels
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