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Old 12 June 2014, 16:35   #1
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oil fuel ratio for Mariner

Hi,

I have an old Mariner M30, 2 stroke engine on my boat, Can anyone tell me what the oil to fuel ratio should be for this?
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Old 12 June 2014, 17:15   #2
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Post a picture please. My guess for any old Mariner would be 50:1, but it would be a safer bet if you helped us identify it as a modernish engine.
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Old 13 June 2014, 03:56   #3
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use a 50:1 mix it will not harm it,I am asuming that you use it for leisure , if you was useing it for commercial purposes the factory, would recomend 50:1 anyway.As i used to say a little extra oil helps to protect the inside of the power head.
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Old 13 June 2014, 15:35   #4
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50:1 it is
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Old 14 June 2014, 05:15   #5
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I can only partly agree that over oiling won't harm a two stroke. You can get away with it on the old yamaha/mariners as they could run in both 1:100 or 1:50, but only on certain model. Always best to stick to the recommendation of the manufacturer. Under oiling will kill an engine stone dead. Over oiling will gum in the rings and spoil performance. It was deadly on the newer 3 cyl yams as it bunged up the scavengers if the engine was used at lower rpm for long periods. It does not take very long if too much or the wrong oil is used. See attached photos of a 50 with very low hours.Click image for larger version

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