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Old 04-01-2008, 07:42 AM
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Default Mercury Optimax Oil

I have a pair of '02 Mercury Opitmax 225's. They have about 1200 hours on them and no major problems. I have primarily run the Mercury Optimax synthetic oil. West Marine had a sale on regular outboard oil this weekend and i picked up a couple of gallons. Will it harm the engine if i mix these two oils together and eveventually just run the regular oil since it is a lot cheaper. Thanks for the input.
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Old 04-01-2008, 08:10 AM
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Default Re: Mercury Optimax Oil

I was told you can use Yamalube. If this is true, it is about 40% cheaper than Opti oil. I was about to ask before I saw this thread.
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Old 04-01-2008, 08:54 AM
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Default Re: Mercury Optimax Oil

Any of mercury guys have input on the yamalube?
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Old 04-01-2008, 09:51 AM
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Default Re: Mercury Optimax Oil

My fishing partner has twin yamies and buys Yamilube in bulk. I have gone in with him on a barrel for the past 2 years and used Yamilube in my merc for the past 3 years with no problems. Saved a butt load of money on oil..

However i read somewere not to mix 2 different oils! Use up what you have in your tanks befor switching over..
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Old 04-01-2008, 09:57 AM
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Default Re: Mercury Optimax Oil

I personally will not use anything but Opti Oil. Search the board. This has been discussed at length.
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Old 04-01-2008, 02:57 PM
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Default Re: Mercury Optimax Oil

Stay with Opti oil. If it is not broken why take the chance??
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Old 04-01-2008, 03:55 PM
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Default Re: Mercury Optimax Oil

I personally run Pennzoils Premium Plus in my 225 Opti. My plugs look great and my prop hub is much cleaner the when I ran the Merc oil. Thats good but not the only thing an oils compatibility should be based on.
Merc will never certify another manufacturers oil for use in their engines. They want you to believe that their engines and oils are so unique that they must be used together....unless you want to use their oil in another brand of engine which is OK too
Tohatsu's TLDI is very similar to the Mercury Optimax. They both use Australian company Orbitals technology for fuel delivery. Tohatsu has a list of oils they certify for use in their TLDI engines. That list includes Pennzoil Semi Synthetic and full synthetic as well as a bunch of other quality oils. These are oils that Tohatsu has tested in their engines and feel they meet the requirements of their DFI platform.
Someone should call Merc and tell them they live in some obscure location and can't get Merc oil for their engine. It would be interesting to hear what they recommend.
Here is the Tohatsu information:
http://www.tohatsu.com/tech_in...l#Q11
"What kind of oil do I need to use in my TLDIŽ?
You will always need to use a high grade TCW3 oil designed for use in Direct Injection motors. Regular TCW3 outboard oil is not recommended for use in the TLDIŽ models Most outboard companies offer a high grade/premium TCW3 oil designed for use in Direct Injection motors. The following oils have been tested by our factory and certified for use in TLDIŽ motors:
Tohatsu Premium Oil

Nissan Marine Premium Oil

Pennzoil Complete Marine Synthetic

Pennzoil Semi-Synthetic Outboard Oil

Mercury Optimax/DFI Oil

Yamaha Yamalube 2-M Semi-Synthetic Injector Oil

Bombardier RAM Ficht Oil

The above oil brands are currently the only brands that have been tested and approved by our factory for use in TLDIŽ systems."
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Old 04-01-2008, 03:59 PM
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Default Re: Mercury Optimax Oil

I keep the above post on file now and just paste it in every time this comes up. To add a little more....
Who here runs Motorcraft oil in their Ford, or Mopar oil in their Dodge, etc. even though the manual will tell you to? Run a good quality synthetic blend or pure synthetic in a DFI and you will be fine. Ther is no magic formula that Mercury engineers are keeping under lock and key. Just a great marketing campaign to keep some people walking through the door of their dealerships.
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Old 04-01-2008, 04:07 PM
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Default Re: Mercury Optimax Oil

This is the kind of testing we need to do. The marine industry has got be larger then the ultralight aircraft industry. Why can we get this type of comparison done? I know this test is not a marine engine test and I am posting it just for the sake of showing what kind of testing could be done.
http://www.ultralightnews.com/features/oiltest.htm
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Old 04-01-2008, 04:16 PM
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Default Re: Mercury Optimax Oil

I have Merc 2002 225 efi's and I have found when I run Yamalube they smoke like crazy....I learned back in the day when OMC came out with their oil injection (VRO) system..... I went through 4 power heads...the mechanic told me OMC knew they had a problem and put additives in their oil to correct the problem..I used bulk Merc oil...my $.02 would be to use Optimax DFI just in case they have put a little something extra in the oil..
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Old 04-01-2008, 04:34 PM
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Default Re: Mercury Optimax Oil

I have always used the cheap stuff from Wall mart. 3 x 225 Opt's (2003) that's fifteen years worth of service with no problems. The 5 yr warranty just ran out so do not have to worry about that any more.
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Old 04-01-2008, 05:31 PM
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Default Re: Mercury Optimax Oil

I wish the study was done by someone other then Sponsor


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Old 04-01-2008, 06:41 PM
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Default Re: Mercury Optimax Oil

I've always used opti oil---guess I'm a sucker. I buy it bulk for $18/gal so it's not that big of a difference anyway.

FWIW--I have 2003 225s with 750hrs---no problems
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Old 04-02-2008, 05:07 AM
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Default Re: Mercury Optimax Oil

Keep in mind guys that by law an outboard manufacture can only tell you what the oil requirements are. He can not tell you what manufacturers oil to use. And in a warrenty situation must honor the warrenty, if the oil requirements have been met.. No mater who makes the oil, as long as the proper type of oil has been used. This is the law..
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