My buddy just bought a 4.0 in April, it's only got like 60k on it. Anyway the problem is that the range isn't leaving it's spot and the engine is fine. ****** fluid is somewhat bad, 'dark and clumpy,' but he just got it and really hasn't had time to check that. He ran a check engine light just prior. I'm guessing a bad ****** filter can cause this. If so what do you few range owners think went on this? Any help is cool, he's stuck in a parking lot in Manchester, NH. Lovin' my disco right now, ha...Thanks