View Poll Results: OPTIMUM 525 EFI Performance
87 OCTANE
37
75.51%
89 OCTANE
8
16.33%
91 OCTANE
3
6.12%
93 or HIGHER
1
2.04%
Voters: 49. You may not vote on this poll
Which OCTANE fuel provides the best performance in your 525 EFI's
09-29-2005 | 02:40 PM
#4
Platinum Member
Joined: May 2003
Posts: 3,707
Likes: 89
From: MA and NH
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.
09-29-2005 | 03:06 PM
#5
Thread Starter
Registered
Joined: Mar 2002
Posts: 1,335
Likes: 0
From: LONG ISLAND-NY
Re: Which OCTANE fuel provides the best performance in your 525 EFI's
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.
09-29-2005 | 03:28 PM
#6
Rob
Joined: Aug 2001
Posts: 21,637
Likes: 9
From: Ms
Re: Which OCTANE fuel provides the best performance in your 525 EFI's
Originally Posted by jdnca1
Don't know about the 525's, but the 500EFI's run much better on 87 than 93.
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09-29-2005 | 03:44 PM
#7
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Joined: Mar 2002
Posts: 4,127
Likes: 0
From: NY
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.
09-29-2005 | 06:31 PM
#8
VIP Member
Joined: Feb 2004
Posts: 12,314
Likes: 1,555
From: Maryland
Re: Which OCTANE fuel provides the best performance in your 525 EFI's
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.
09-29-2005 | 07:32 PM
#9
Registered
Joined: Mar 2001
Posts: 114
Likes: 1
From: Quinnesec, MI.
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.
