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    What is the vent cap on the top of Oil Reservoir Tank for?

    Could anyone kindly tell me why there is a vent cap on the oil reservoir tank of my 1993 Mariner 75 hp 3Cyl? It is an oil injected motor, and the tank is full. Should I leave the vent cap open while running the motor? I just purchased and had the motor installed, and want to make sure that I do...
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    Spark Plug type for 1993 Mariner 75hp 3 cyl.

    Hey folks...so glad that I found the iboats forum! What a wealth of information. I just bought a used 1993 Mariner Outboard and just had it installed on my center console. Can anyone recommend which brand and type of spark plugs I need. They need to be changed, because they are looking pretty...
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