Like Tree0Likes

Mercury Outboard Oil Mix Ratio?

Reply
Old 08-10-2002, 07:18 PM
  #1
rws
Registered
Thread Starter
Trade Score: (3)
 
rws's Avatar
 
Join Date: Jan 2001
Location: Toledo Ohio Eubank Ky
My Boats: Python
Posts: 562
Default Mercury Outboard Oil Mix Ratio?

This is a question for the Outboard Guys.
My Friend has a pair of 99 280 Hp. Mercs, He is running Klotz synthetic oil at a 32 to 1 ratio . I think this mixture is excessive for a synthetic oil.I used to run 80 to 1 in snowmobiles. What oil and ratios do you in your Mercury outboards?

Thanks
Rob
rws is offline  
Reply With Quote
Old 08-11-2002, 01:26 AM
  #2
Platinum Member
Platinum Member
 
mcollinstn's Avatar
 
Join Date: Sep 2001
Location: tn
My Boats: 1991 F311SR1
Posts: 5,491
Default

I ran 50:1 in all my pleasure motors. I ran 32:1 in all my dragrace motors.

Whatever ratio his Merc manuals specify should be fine with a premium oil. Be sure to note that changing ratios changes carburetor jetting.
mcollinstn is offline  
Reply With Quote
Old 08-11-2002, 03:03 AM
  #3
Charter Member #232
Charter Member
 
Audiofn's Avatar
 
Join Date: Oct 2000
Location: Carlisle, MA USA
My Boats: 1979 Formula 302, 99 Formula 353, 81 Donzi 18 2+3 with 454
Posts: 18,379
Default

at 280 I assume these are 2.5 efi's. I would not thin them out at all. Better to run them with plenty of oil then not enough. Cheap insurance if you ask me

Jon
__________________
Put your best foot forward!
Audiofn is offline  
Reply With Quote
Old 08-11-2002, 08:43 PM
  #4
Registered
 
Join Date: Feb 2002
Location: Honeoye, NY
My Boats: '77 Martini 7 Meter
Posts: 763
Default

More oil is not always better!! Oil mixed with gas and then burned is the final fuel. On a 2/cyl., oil passes through the crankcase with gas and maintains a healthy lower end. The least amount of oil needed to lubricate the crankcase is what you want. More oil than needed lowers the octane of the fuel you burn leading to detonation. I have always found that a really good synthetic (I use AMSOIL mixed at 75 to 100/1) will give you max. performance at even over recommended RPM's, burn clean, and keep the engine very healthy. --- Jer
jpclear is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
steve303
General Q & A
4
07-30-2008 07:11 PM
OSO News
Offshoreonly Industry News
0
01-21-2008 08:50 PM
Warlock 28 SXT
General Q & A
10
06-28-2007 07:08 PM
Strip Poker 388
General Q & A
0
10-14-2003 12:27 AM
RSCHAP1
General Boating Discussion
9
05-31-2003 12:54 PM



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 12:13 AM.


Copyright 2011 OffShoreOnly. All rights reserved.