If you have blue smoke coming out of the tailpipe, you are burning oil, usually caused by oil leaking from the exhaust valve guides. The best service manual for the do-it-yourselfer is Haynes Repair Manual for Dodge Intrepid, Chrysler Concorde, LHS, and 300M for 2nd gen LH cars 1998-2004. The series number for that service manual is 25026.