View Poll Results: OPTIMUM 525 EFI Performance
87 OCTANE
35
74.47%
89 OCTANE
8
17.02%
91 OCTANE
3
6.38%
93 or HIGHER
1
2.13%
Voters: 47. You may not vote on this poll

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Which OCTANE fuel provides the best performance in your 525 EFI's

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Old 09-29-2005, 02:49 PM
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Default Which OCTANE fuel provides the best performance in your 525 EFI's

Just curious to see who runs what octane for top performance.

All comments welcomed............
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Old 09-29-2005, 03:23 PM
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Default Re: Which OCTANE fuel provides the best performance in your 525 EFI's

Don't know about the 525's, but the 500EFI's run much better on 87 than 93.
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Old 09-29-2005, 03:34 PM
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Default Re: Which OCTANE fuel provides the best performance in your 525 EFI's

87 burns hotter quicker
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Old 09-29-2005, 03:40 PM
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Default Re: Which OCTANE fuel provides the best performance in your 525 EFI's

Spoke to Mercury last week about that ,and synthetic oil w/the 525. 87 octane is recommended.Anthing over 89 can actually hurt performance.As far as syn oil,they cannot endorse it as this time.Said that they have experienced some oil pressure problems with it.
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Old 09-29-2005, 04:06 PM
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Default Re: Which OCTANE fuel provides the best performance in your 525 EFI's

Quote:
Originally Posted by pm203
Spoke to Mercury last week about that ,and synthetic oil w/the 525. 87 octane is recommended.Anthing over 89 can actually hurt performance.As far as syn oil,they cannot endorse it as this time.Said that they have experienced some oil pressure problems with it.
YUP....that on going SYNTHETIC debate......Heard the same from Mercury as well about some oil pressure problems with it.
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Old 09-29-2005, 04:28 PM
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Default Re: Which OCTANE fuel provides the best performance in your 525 EFI's

Quote:
Originally Posted by jdnca1
Don't know about the 525's, but the 500EFI's run much better on 87 than 93.
I allways heard 87-89 was better??
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Old 09-29-2005, 04:44 PM
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Default Re: Which OCTANE fuel provides the best performance in your 525 EFI's

The higher the octane the slower it burns,,, you would only require higher octane on a higher compression motor where, pre-ignition or detonation is possible. It slows down the combustion process so the cylinder actually fires when the spark plug fires. Running 93 it in a motor that does not require it is a waste of money and will decrease performance.
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Old 09-29-2005, 07:31 PM
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Default Re: Which OCTANE fuel provides the best performance in your 525 EFI's

Quote:
Originally Posted by Chris288
The higher the octane the slower it burns,,, you would only require higher octane on a higher compression motor where, pre-ignition or detonation is possible. It slows down the combustion process so the cylinder actually fires when the spark plug fires. Running 93 it in a motor that does not require it is a waste of money and will decrease performance.
ditto, octane controls the burn is it, I run 87 and my 500EFI's run great... for oil i switched to 20W50 mobil 1, pressure is back up and consumption slowed tremendously, just a quart every couple weeks as it was a quart a week.
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Old 09-29-2005, 08:32 PM
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Default Re: Which OCTANE fuel provides the best performance in your 525 EFI's

I have the 525EFI, 87 works best. I think mobil 1 one V-twin or the mobil 1 15-50 weight is best. Seems to burn less oil and keeps oil pressure higher when hot.
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Old 09-30-2005, 07:20 AM
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Default Re: Which OCTANE fuel provides the best performance in your 525 EFI's

I use the 87.....it runs the best..but if 89 is the only thing they have, I go with that. Keeps you from having to search out higher octanes
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