The engines on my Formula 330 were the Multi-Port Injected (MPI) type.  They start up nicely, but require a more extensive oil fogging process during winterization.  I had to read up a bit on fogging an MPI engine versus a carburated engine.  Essentially, it involves running an oil-rich mixture of ‘2-cycle fuel’ through the engine.  Much like the oil/gas mix of a 2-cycle engine coats and lubricates the internal parts of the engine, so does the fogging mixture on an MPI engine (at least the ‘top end’ of the engine in this case).

The ‘fogging mixture’ for the MPI engine is gasoline & 2-cycle oil in a 10:1 ratio along with the proper amount of stabilizer.  Published instructions say to mix up 5 gallons of the fogging “cocktail”.  That amount of fuel seemed like a lot, so I mixed up about 2-1/2 gallons . . . and it still was too much.  I used about 1-1/2 gallons total for 15 minutes of running time on each engine. The part of the process that is a bit cumbersome is disconnecting the fuel lines at the fuel filter inlet and connecting the remove tank containing the fogging mixture.

Below are a few pictures of the engine fogging and a YouTube video as well.

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