[phatdaddy]

I m running some Merc Premium in my 2 stroke lawn equipment that s at least 8 years old, no issues. I do premix, no injection system. I ran 30 wt Quaker state in my first OB, small coke bottle in a 6 gallon metal gas can.

Quick google search says 5-8 years

I would be hesitant to use in an Optimax or modern Evinrude, but not in anything carbed and premixed