The escapement works with radial friction yes...and it therefor needs no oil. So it is a better design of the escapement mechanism you won't hear me say anything different. But like I said before, all the other parts do need oil and service like every other movement! Some oil may have a life span of 7-10 years but that is theoretical. I have torn apart 100s of watches, Pateks, APs, Rollies etc and after 5 years of wearing all the oil and grease has either dried up or gummed up. And these brand also use the best of the best when it comes to oils. So why do people buy a co-axial? Because of the whole story of Daniels behind it and the the way they marketed it as 'the' biggest invention in watch history the last decade'. Sure at the AD they tell you it only needs service once every 10 years or so but that's also a marketing gimmick. I truly truly believe and promote as much service intervals on a co-axial as on a regular movement. You should see how the keyless works looks after 3 years... all the dirt and debree that comes in with the crown operation will contaminate the whole movement. Not to mention non-movement related parts like seals. No co-axial escapement will safe your watch from dirt, water or gummed up oils.