Optimax vs Premium Plus oil question...

snookfisher

Recruit
Joined
Jul 13, 2010
Messages
5
I have a 2003 Mercury 225 Optimax that has been using DFI / Synthtic oil since it was new. Have never had one single problem with the engine - used in saltwater exclusivvely and has been incredibly dependable.

I was told today that it is OK to now use Mercury Premium Plus oil instead of Synthetic as it will not harm my engine or its performance. I am considering it since the new sythetic pirce is creeping above $35 per gallon now. The guy that told me this said that Optimax Synthetic oil is actually best for the engine when you are trolling offshore for long periods of time and the Prem Plus is actually better for overall use. Sounds sensible to me, but just a little cautious to change if this is not actually the case.

Does anyone out there really know about this or have personally changed and had positive results? Thank you.
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,127
Re: Optimax vs Premium Plus oil question...

My neighbor has a 150HP Optimax of about the same year, or perhaps a bit newer. His owners manual cited TCW-III oil as OK to use. You might check your owners manual and see what are your choices.
 

sxmerc

Petty Officer 1st Class
Joined
Jul 13, 2010
Messages
247
Re: Optimax vs Premium Plus oil question...

I know it's more money, but stick with the DFI oil. Formulated to produce less carbon build up, less smoke. Premium plus oil will "work" but I've replaced lot's of air injectors on customers motors that are running this oil. The pintle is easily carbon bound on these motors, and at $300.00 retail a piece, it can get pricey. While you're at it, you should consider running quickleen in your fuel as well. Good luck.
 

Solittle

Fleet Admiral
Joined
Apr 28, 2002
Messages
7,518
Re: Optimax vs Premium Plus oil question...

Why would you want to mess with an engine that is running perfectly?
 
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