'96 Echelon engine oil

[auj130]

I have a new to me echelon with a Mercruiser 350 black scorpion engine and is due for my first oil change. I have asked several people about what they use and gotten just as many opinions. What is the best oil to use in a fresh water lake in South Carolina. The manual recommends Quicksilver marine oil which I found in a 25w-40. I also have friends using diesel oil 10w40 in a 2012 Response, and Valvoline VR1 SAE40 (in a nautique).

We have run the boat 2-4 days/week pulling slalom, swivel, barefoot, and my 7 year old on trick skis so we are at all different speeds and engine load.

Any consensus on what to put in the boat would be great, I don't really need 35 new options to add to the mix

Edited September 25, 2021 by auj130

[Rednucleus]

Do you mean Black Scorpion? Oil viscosity is more important than brand. My 95 Sanger 350 had a sticker on the motor listing proper weight oil.

Found this on Black Scorpion hope it helps:

https://www.maritimepropulsion.com/files/pdf/1001258

20w-40; also says should be running atleast 91 octnane fuel

Edited September 25, 2021 by Rednucleus

[auj130]

9 minutes ago, Rednucleus said:

Do you mean Black Scorpion? Oil viscosity is more important than brand. My 95 Sanger 350 had a sticker on the motor listing proper weight oil

Oh yeah my bad, its a scorpion. I'll edit my post quick 
thanks, I'll run down to the boat and look for the sticker.

[Rednucleus]

Please see my edited post for probably all the info you need!