1999 Mercury 125 HP oil.

[Superboild82]

I'm new to 2 stroke out boards. I have a 99 125 mercury that is oil injected. What is the best oil to run. Should I run the Genuine Mercury Premium Plus 2-Stroke Synthetic blend or Genuine Mercury Premium 2-Cycle . Will I notice a difference in these oils. Or would I be better off running Quick Silver Premium Plus synthetic blend. Trying to figure out if I should be running the more expensive synthetic blend or not. Thanks.

 

[Johnson110]

Premium plus is what I use, have the 115 hp mercury 2+2 motor same as yours!

 

[Alumarine]

Any TC-W3 rated oil will work just fine in that motor.
Some notice less smoking with synthetic.

 

[jimmbo]

The Mercury Premium Plus 2-Stroke Synthetic Blend is a very good oil, the Quicksilver Premium Plus synthetic blend is the same oil. Different label and branding to allow 3rd Parties(non Merc Dealers, and other retailers) to sell the oil.

The TCW-3 spec is a little over 20 yrs old. There are lots of oils that meet the spec, some exceed it, some just squeak by. An engine manufacturer is not going to produce/market an oil that squeaks by. Some oils like Mercs Opti DI oil, and BRP XD 100 exceed the standard by a very wide margin even though they are not TCW-3 certified, but they had to be developed to keep the DI engines(Optimax, FICHT, and E-tec) engines alive, TCW-3 didn't cut it for those engines

 

[Johnson110]

You can buy the premium plus in bulk, bring your own container outboard repair shops have this. I think that it is worth the extra dollars for the better oil less carbon which kills the motor.