I recently added 4 oz of Lucas UCL gas treatment. I then added some leftover MMO. I must admit my car seems to have more pep then using strictly the Lucas by itself. Is this a good idea to mix the two?
I think so, as it's used as a fairly routine summer fuel supplement in my daily driver. Not sure what ratio between the two is optimal, but I haven't had any problems with it at all. I reuse the Lucas bottle for the composite mix year round, while switching to Amsoil PI & MPC FT-10 during the winter months.