The Lucas stuff is mainly harmful to your wallet. There is no way any of us can home-brew better oil than the oil company chemists can mix up to meet a certain price point. If you want better oil, buy better oil.
That said, if you have a specific problem, a few specific products can address that problem. Kano Kreen and Marvel Mystery Oil, in separate ways, are somewhat effective in cleaning baked-in carbon from the piston ring grooves and allowing the rings to seal better. That might be a help for your oil consumption. Otherwise, use any good brand of oil of the viscosity recommended for your engine. Also, be sure your positive crankcase ventilation valve is clean and working properly; a gummed up one can also cause increased oil consumption.
That said, if you have a specific problem, a few specific products can address that problem. Kano Kreen and Marvel Mystery Oil, in separate ways, are somewhat effective in cleaning baked-in carbon from the piston ring grooves and allowing the rings to seal better. That might be a help for your oil consumption. Otherwise, use any good brand of oil of the viscosity recommended for your engine. Also, be sure your positive crankcase ventilation valve is clean and working properly; a gummed up one can also cause increased oil consumption.