If the lawnmower was made in Deutschland, I bet pscholte's stomach would rest easier with the use of the Elvish Green Elixir in such a mundane internal combustion device.
Look at it this way:
Over on the oil analysis board there's a guy with a big Lexus using Wal*Mart SuperTech oil with great results. I'm just using reverse psychology.
I've noticed that any time I change oil that the "new oil" makes my engines so much quiter and smooth that the old oil. I wonder if our subjective notions are really do to a different oil.