I went to purchase some Two Stroke Oil yesterday as we are about to fill up with diesel fuel. I regularly add TSO (Two stroke oil) to our diesel fuel at a ratio of roughly 200 to 1. It certainly seems to make a noticeable difference.
Mo and I have tried to run without several times and quickly notice that the engine becomes noisier and runs erratically.
We are convinced that on our 1990 engine it works well. It replaces any lubricity lost by having to use low sulphur fuel.
When I went to the outboard motor shop yesterday I found it is run by a technophobe who immediately asked what type of TSO I wanted. What do you mean? I asked.