Chrysler 2.7V6 engine: I have repaired several of these . I have not seen a sludge problem,However the oil pickup tube is to close to the oil pan . Remove the pan , remove the very bottom section of the oil pickup tube, or drill several small holes in it ( VERY Very carefully ) not to damage the screen!!! Now this poor criticized engine will get the oil it needs and run 100s of thousands. I think Chrysler should have recalled these Engines!!! That was my two cents. Phil