Why not use engine oil containing no TCP?
TCP is an organophosphate. Organophosphates are anti-wear agents and are used as aviation lubricants to make engines safe. Although there is a lubricant on the market which uses an alternative organophosphate to TCP, according to the manufacturer it is not typically used in civil aviation and research about its health impacts is under way. So we do not know if it would be safer or healthier. The alternative oil is already being used in military aircraft, and although not widely used in commercial aircraft, it already has approval for most of them.