I have been trolling this board lately and trying to learn as much as possible. I drive a 2002 Honda Civic Si, as I am sure you know the owners manual calls for 5w-20. I was first skeptical about this weight. It sounds as though this board is beginning to accept this weight and after seeing results from oil analysis I though that I would give this weight a try. I would like to use M1 (for various reasons) and have been waiting for them to release their version of 5w-20. Being impatient I emailed Mobil 1 and asked them when they will release this new weight to the market. In response to the email I received: "Mobil1 0W20 motor oil will be available in March 2003 which will be approved for all 5W20 vehicles." My question is with the varying support of the thin 5w-20 how will this even newer, even thinner 0w-20 be accepted?