OK I know this had been hashed out many times. But I have a final debate! First off I am getting a 04 yz 450 this Monday. So I need to break in the motor. I planed on using Yamalube 4 during the break in period. Then because of availability and cost I was going to switch to Mobil 1. I thought Yamalube 4 was going to be crazy expensive but it is the same cost as Mobil 1. Other than I can get Mobile 1 at Wal-Mart at 2am in the morning, what are the benefits to run 100% synth? I know it is slicker, but it is that much better why no use it in the break in?