My son-in-law racer swears by Nix Frix Shun the UK outfit and I suspect this is there lube plus a leather conditioner. I rotate religiously through bikes so do a lot of pumping and add a couple drops a couple times a year and my now vintage pump feels great but can't really say that it adds life as I rebuild the pump only a couple years back and use the Silca NFS on the piston gasket and Molykote PFPE on the chuck gasket.