I have put 55,000 on my duratec in 2 years and it still runs like a champ. The only problem I had was the AC went out after about 5000 miles which was covered under warranty. The only things I notice are as follows:
Slight knocking when in reverse...mostly from brakes I think
During acceleration and clutch release from a stop I hear a clicky noise until the clutch is all the way out...nothing new
slight rattles here and there
Sometimes my car doesn't start on the first turn, but it always starts on the second...may be something I could correct with a tune so that my computer recognizes all this extra air coming in from the intake and exhaust.
My new car I have about 7300 miles and a few probs that were fluke things like teh shifter cables coming undone but was covered under warranty. My last car had almost 50,000 miles on it and no enginer wear.
had the ticking problem since the day i bought the thing my dads a machanic and he said its just the damn injectors on the der's there so loud and it seems like when its hotter its louder but i could be wrong but other than that i havent had anyproblems only have had mine for 3 months and i have 3500 miles on it i drive alot.
When I first got my Focus, I was driving real fast before I pulled it over at my house. Well I popped the hood to check out how the engine sounded after it was ran hard and noticed a ticking sound. The car only had around 300 miles on it and I naturally freaked called the dealership and took it in. The checked it out and called me out while it was running only to inform me that it was the injectors causing the sound. I felt dumb but relieved and as of since have not had a single issue with this car other than a few hard starts. Go Duratec!