reliability
The engine was originally designed to run upwards around 500,000 miles by International as per Ford requirments. if you take very good care of it I have seen some run very near that. biggest thing is to keep your oil changed!!! the injection system uses high pressure oil to operated the injectors. so clean oil means less problems with sticking injectors. believe it or not these engines need to be worked hard, ie towing and highway driving. idling and stop light to stop light is very hard on them. keep your fuel filters changed is the second big thing. As far as real engine problems, very few. egr coolers are a weak point but it is usually caused by high exhaust temps. The injector issue was ford biggest problem and they have finally come up with a good fix, and it only requires a pcm reflash by the dealer. I can say that 90 plus percent of the injector problem I now see are repaired by this reflash. I do see an occasional head gasket here and there but the engines themselves are pretty much bomb proof.:icon_ford: