Re: Is Seafoam avaiable in Australia?
Each outboard manufacturer has it's own brand of de-carbon treatment. Some are designed for maintenance, some for shock treatment and some for both purposes.
BRP/Evinrude markets Evinrude Johnson Engine Tuner for shock treatment and Carbon Gaurd for maintenance. Yamaha markets Ring Free.
There are some Engine tuners not connected to outboard brands such as Valvtect Marine Motor Tune Up that may be available.