I use the exact same oil for my STI, EX5, and CBR. It's expensive, but it's cheaper than the Amsoil (which my car seems to heavily favor) and my vehicles have been very happy with it. It seems like the perfect oil for SoCal conditions and spirited/track use.Going to stick to the service manual intervals. Seems good enough to me. Shell Rotella T6 5W-40 Full Synthetic.