Our new ST now has 1500 miles. We just got back from a family vacation to Denver (from Grantsville, UT). My wife noticed a clicking noise coming from the engine. It's rhythmic with the rpm's. It could be normal, but doesn't sound like any engine I've heard. The oil is perfect and it doesn't have enough miles for a stuck lifter, IMO. I looked for debris caught in the fan and underneath. If there was anything underneath I wouldn't be able to see it. Anyone else experienced anything like this? It's not easy to get into the dealership right now.