Mercury 850 thunderbolt engine (unsure of year) - oil/fuel mixture

[stuartphipps]

I have recently just purchased my first Mercury engine and was unsure on the oil/fuel mixture needed for this engine.
Any advice would be amazing?
Cheers
Stu

 

[roscoe]

Welcome to iboats.

The gas to oil ratio is 50 to 1.

2.6 ounces of oil per gallon of gas.

 

[GA_Boater]

Once again Roscoe is amazing! Yep - 50:1