intersting...M1 would be louder on my 3800...then i changed to dino for my Auto-RX treatment only. Both the Chevron Delo 15W40, and Quaker State 5W30 have made lowered the noise quite a bit. Not that it was ever unbearable or damaging...just a quiet humm again. Does Redline suffer M1's weakness in this case? That is what i may change to soon.