I had 1 of the first injected 140hp johnsons made in 83 after blowing a piston because of oiling probs I had the system removed and mixed my own. My nephew now has that boat and still runs great. About 4 years ago the 93 150 mariner on my boat now had the gear that runs the injecter pump go out. They said around $2000 to replace it or $150 to remove the system and mix my own. Been mixing that 1 for the last 4 years now with no probs.