Guest post by Omar Akhtar (@obakhtar), Managing Editor, Altimeter Group, a Prophet company Imagine you’re getting ready to drive your car. But when you turn on the engine, you get a mobile notification telling you that your oil needs to be changed, and it gives you a link to the nearest dealership with a 10% discount coupon. You’re left surprised and delighted by the sheer, almost magical convenience of it all. But is that event classified as a sales, service…