Alright I know this has been beat to death.....but I havent quite found the answer I'm looking for by searching. I have a 06 CRF250R and I just had the head redone with oem titanium valves. I heard that leaded gas can make the valve seats harder and making the valves not last as long. I thought that lead was softer than the head material so how could it make it harder? I was either going to use 104 leaded that i can get at a terminal, 100LL, or lead additives to pump gas. Overall, will leaded gas be beneficial to Ti valves?