Oil Pressure just dropped out and motor seized, due to sludge buildup, dealership said not covered on extended warranty because they said I did not change oil every 3000 miles "I did". Installed new engine and still have the problem. Like clock work every 3 to 4,000 miles oil pressure will drop out. I have begun to use synthetic oil and a 10 minute sludge flush every oil change....Dodge says not a defect with the engine/cooling design, I say bull...seems funny that its happening to the new engine now...

Oil sludge caused the engine to overheat, cracking the cylinder heads, which leaked oil with the anti-freeze and killed the engine. After some research, I found that it's a common problem with the 3.9L engine due to a flawed cooling design. The engine block doesn't cool adequately, resulting in hot spots which cooks the oil to sludge in some areas. The sludge builds-up and restricts oil flow which raises the engine temp even higher. Dodge replaced the oil pressure sending unit because it was indicating a loss of oil pressure when there was enough oil. I soon learned there wasn't anything wrong with the sending unit because it was alerting me that a serious problem was occurring. Dodge denied the engine had a design flaw and accused me of not changing the oil regularly. I'll NEVER buy a Dodge or Chrysler again!