Hello skhell
That is an interesting project you are working on. Is the lubricant you are injecting into the engine air intake an item that is normally found in the gasoline the engine normally would burns but that the LPG gas does not have? I was not aware that this was required when using LPG to power a car. I assume the lubricant is required to extend the valve seat and valve live since the rest of the valve is lubricated by the normal engine oil. In the old days of leaded gasoline this job was done by lead in the gasoline. I have wondered what was used when the lead was removed, but have assumed that improvements in valves/seats made a lubricant not necessary. If you have some details on this I would like the read about it. Thanks.