Re: Mercury 3.3 HP gag/oil mix 2003
Mix 50:1 with quality mfr's oil rated TCW-3 or better. Use regular unleaded non-gasohol if available, if all you can get is gasohol use regular, your little kicker won't need any more octane than that and higher grades have more alcohol which is less-than-desireable.
Use a carbon-cleaning additive at least several times a season, this'll keep your rings from sticking. Seafoam is great stuff and also acts as a fuel system cleaner & fuel preservative.
www.seafoamsales.com
If you can't get Seafoam, all major outboard mfr's offer carbon cleaning additives and fuel conditioners. Chevron Techron additive works well, also.
HTH & enjoy........ed