I just had to replace my 97' Quest engine, with only 82K miles, because of "a missing oil lubrication hole from the crankshaft bearings", (from phil bailey at cars.about.com). The work was done at a rural Ford dealership because of where it broke down. My local Nissan Service Manager denied that they had had any problems with the engines, but phil B. says there is a "secret warranty". What's the best way to get Nissan to cover the costs of replacing a defective engine??? I only know about this because the Ford mechanic honestly answered my questions.