I've always ran Brad Penn 20/50 bearings always have looked good at tear downs, religiously warm motor and driveline by motoring around pits. Water temp to 200-210 then let it cool to 140. I use a block heater even during the summer unless really hot Ohio weather and try and pull into burn out box @ 180 water temp. Aluminum rods live and bearings look good. there may be something better out there, but she's not hurting parts so I'm not changing a thing.