PCR it is not necessary to lube the front bearing as the bearing gets it oil from the fuel during the time the engine is running. What the person that told you that might have meant is to use after run oil when you are done running the engine for the day. At the end of the day dump all remaining fuel out of the fuel tank and turn the engine over and run it until it is out of fuel and then bump it a few more time just to make sure there is no fuel left in the engine. Then simply put a 6 of 8 drops of ARO down the carb throat and a few down the glow plug hole and bump it on the box a few times and you’re done. I race sometimes twice a week and don't even bother with the ARO, just run the fuel out. If I was going to store the engine for a few weeks then I will use ARO.
Hope this helps