About twice a week when I start up in the mornings I get the "Check Engine Oil Pressure" in the Message Center. As soon as the engine oil pressure gage starts up the light goes out. I took it to the dealer and got the old "Could Not Duplicate" answer. Truck is a 01 with 67,000 miles. Oil is 15-40 Rotella T and only have 3,000 miles sense last oil change. Any Ideas why I am getting this in the message center. Only does it after truck sits over night and it does not do it every morning. Thanks for any help.