A dealer has a 1999 Intrepid I was looking at for a friend of mine who lives a little farther away (He saw it online). I saw the car, it is in great condition and the motor is almost silent. The only concern I have is the motor. It has the 2.7L V6. I looked it up on Car Complaints and it said the 2.7L is prone to sludge related engine failure. He is better than me when it comes to changing oil, his Trailblazer gets Mobil 1 every 3K. Do you think the sludge problem could be prevented with 3-4K oil changes? Also, does anyone have experiance with the Dodge 2.7L? TIA!!!