Just turned 5K miles and am considering changing from HD360 to M1. On my 08' Softail I changed to Amsoil Syn at 1K miles and started using 8oz of oil every 500 miles. I also put on a power commander and straight pipes. I don't know if the oil burn was cause or effect. My 09' burns 2 oz of oil in 2500 miles which I am very happy with. Here is the question? Do any of you notice increased oil consumption after changing to synthetic?