2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 37Get this manual
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MAINTENANCE
aOil Filler CapDipstick Engine Oil Capacity (Without oil filter replacement) 5.8 Liters (6.1 U.SQuarts) Engine Oil Capacity (With oil filter replacement) 6.0 Liters (6.3 U.SQuarts)