You'll definitely be able to smell if its fuel. Plus if you take a plug out and it dries in about an hour its fuel. If the threads are still wet, its oil
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2009 Monaco Blue BMW 335 XDrive, Beyern 18s, KWv1, MHD, VRSF Full, ARM FMIC, BMS DCI, Stett CP, Forge DVs, Stage 2 LPFP, BMS OCC, (soon) M3 Rear Sway, VTT Stg 2, MMP Inlets
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