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Author Topic:   Optimax Oil Consumption
EricMunoz posted 08-09-2003 12:04 PM ET (US)   Profile for EricMunoz   Send Email to EricMunoz  
My 2000 Conquest 28 came with Twin Merc Optimax 225HP.
I am happy with the fuel usage, but very unhappy with the oil usage. They use 1 gal. of Quicksilver Plus for every 23 gals. of fuel. (23:1). The engines have 340 hours, and are very well maintained and never abused. I usually cruise at 32MPH at 4200 RPMs. I also drive at idle speed at least 2 hours every time I go out, because of the "no wake zones".
Is that considered normal? If not, what can be done to improve this situation?
Thanks in advance for your comments.
kglinz posted 08-09-2003 02:43 PM ET (US)     Profile for kglinz  Send Email to kglinz     
That sounds like to much oil. I got close to 50:1 on mine. It must be computer controlled because the engines run double oil for the first few hours. I used DFI oil but that shouldn't matter . I had the same boat/eng combo and ran about the same. Check with your dealer.
Kemp Lindsey
dauntlass 18 posted 08-10-2003 10:32 AM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     
I have a 200hp Optimax on 21ft.Conquest.I use about one gallon of Optimax DFI oil per 75 to 85 gal. of gas.
Fishcop posted 08-11-2003 08:07 PM ET (US)     Profile for Fishcop  Send Email to Fishcop     

My 2000 225 Optimax uses less than 2 gallons of oil for every 140 gallons of fuel.
Sounds like you are using too much oil.

Also, you should be using Optimax oil.


lakeman posted 08-16-2003 05:45 PM ET (US)     Profile for lakeman  Send Email to lakeman     
I had a friend, who's 225 opti gave him nothing but fits and one was the oil consumption and it never work right untill he made a deal for a new boat. However, every one looked at it from Merc and several dealers. Finally the solution came from a merc rep who suggested he change Props. Yes that's right, he or I could not believe it but when he changed props most of his problems and the iol consupmtion problem went away. I have no Idea what he changed to and he has no e-mail. By the way he bought another opti.
Jamie 20 outrage posted 08-16-2003 10:15 PM ET (US)     Profile for Jamie 20 outrage  Send Email to Jamie 20 outrage     
Lakeman, Actually what you write could make sense. If he was overproped, the engine, through its sensors could know that it is under a high load, and add extra oil to protect the engine.
Eric Munoz posted 08-17-2003 09:44 AM ET (US)     Profile for Eric Munoz  Send Email to Eric Munoz     
I installed a pair of Cobra Plates (similar to the Hydrofoil), trying to get on plane faster. I wonder if that could be causing extra load and consequently increasing the oil usage. The props are the original ones.
Thanks guys for your thoughts!
Jamie 20 outrage posted 08-17-2003 02:24 PM ET (US)     Profile for Jamie 20 outrage  Send Email to Jamie 20 outrage     
First of all, just because they are original props does not mean they are the correct size. Secondly, nobody should add those plates unless there is a need. Of course dragging more stuff through the water will hurt top end, the idea is that there is a larger problem that the fins will help with. usually the problem is that the boat doesn't want to plane off. To determine if you have the correct props, run your boat at full throttle with an average load and notice the rpms. The number should be close to the printed max for the engine, if not a little higher. If it is 200 rpm lower than the max, fix it. You can send your stainless props to a rebuild shop to be repitched. Tell them the numbers and they will tell you what they will do to fix it. If they are aluminum props buy smaller and use the old props as spares.

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