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Posted

Wrench, I am aware of your distaste for the "Black" motors but you have always been truthful and knowledgeable on such matters. I have a Ranger360V with an 87 Merc 175 that i have had for over 18 years and always run Quicksilver Oil in it through the oil system on the motor and tank in the bottom of boat. I have run 91 Premium Ethanol free fuel in this boat and never had problems. I am now the Proud owner of my 2nd Ranger Boat 2009 Z520 with an Optimax 250 that has 150 hours on the motor. This boat is equipped with a remote fill for the oil tank on the right rear corner close to the splash well to fill the tank in the bottom of the boat and fuel tank fills on the left side by passenger seat. for both tanks and a switch by the driver seat  for switching fuel tanks. This is where my question comes in ( sorry for the long winded story )    What oil do I need for this Mercury motor and what fuel should I be running, I am hearing so many different things, IE no 91 octane it will blow up and run hot, run this oil, run that oil I do not have a good source for trustworthy information and I TRUST you because you are willing to help people for free even though you get a lot of crap on here. Thank you Wrench    

RANGER.pdf

Posted

If an Opti you likely need to run the Opti DFI oil.  Mine sips the stuff, a tank lasts quite a while.

Mike

Posted

Screenshot_20250918-173758~2.png

This is your recommended oil. 

 

As for fuel....

Regular 87% octane....as FRESH as you can get it.   Try to keep it less than 3 months old. 

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