Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 16Get this manual
Changing Engine Oil NOTE: The oil should be changed more often when the engine is operated under adverse conditions such as extended trolling
NOTE: The outboard can be tilted up for ease of filling8Remove the oil fill cap (d) and refill with one U.SQuart (1 Liter) of oilReinstall the oil fill capIMPORTANT: Do not overfillBe sure that the outboard is upright (not tilted) when checking oil
Oil Filter Change Intervals
Clean the filter at each oil changeReplace the filter if it is damaged (cracked, torn, dented, etc
9Start the engine and watch to make sure that there are no oil leaksIf there are oil leaks, stop the engine and find the cause10Reinstall the drain plug access cover (e) with screw
Engine Oil Capacity