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Old 06-01-2009 | 08:05 AM
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Ken N
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Arrow what octane
I have a 1999-502 MPI. What is the lowest octane fuel i can run. 86 octane is what i can get at the docks.
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Old 06-01-2009 | 10:02 AM
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Default octane
I beleve mercruiser spec's 89 octane. If it has a knock sensor it will adjust the timing back. you may want to look at some octane booster. But check the merc manual, it will list the min. octane number. 86 is pretty low, I would fill up on the trailer if possible.

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Old 06-01-2009 | 12:07 PM
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86 octane??? I've never even heard of that before. Out here 87 is the lowest. BTW, stock merc black motors, are designed to run on 87.


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Old 06-01-2009 | 12:20 PM
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I've never even seen or heard of 86 octane????

502mpi's are designed to run 87 octane.
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Old 06-01-2009 | 03:03 PM
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Originally Posted by Griff
I've never even seen or heard of 86 octane????

502mpi's are designed to run 87 octane.
What he said....
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Old 06-01-2009 | 09:33 PM
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I have seen 86 octane in Denver, CO (mile high).
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Old 06-02-2009 | 09:05 AM
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Arrow
Originally Posted by Ken N
I have a 1999-502 MPI. What is the lowest octane fuel i can run. 86 octane is what i can get at the docks.
I stopped at the marinea to check the octane it is 87 octane.
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Old 06-02-2009 | 09:12 AM
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In Missouri 87 is the lowest I've seen. In Colorado 85 is all over the place.
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