In all seriousness, if you run some water inside-out through the filter before you clean it, and you see some sort of color tinting the water, it's probably oiled. Have you looked @ Stillen's website?
You could also call Z1 or go onto your account online and see what the invoice says...
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'14 MB Nismo | Boost Lab 6870 1.32 AR 553 HP / 471 ft.-lbs.
Betty Mods
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