6.0 liter diesel engine needs oil cooler & egr cooler replaced every 100,000 miles according to ford mechanics. my engine had this problem at 98,000 miles. the cooler is underneath the intake manifold making repairs very expensive. the mechanics tell me to watch for smoke, less power, etc. and to pull off the side of the road and call a tow truck when i experience those problems or i could destroy the engine. they said my engine oil is running much hotter than my engine coolant which could cause oil seals to begin leaking. there is no way to verify this problem. i don't have a oil temperature gauge in my truck just a oil pressure gauge. ford needs to stop selling this engine or repair the problem.