Things to check before buying
We test drove an '05 6.0 PSD Excursion yesterday. During the drive, the water and oil temperature difference never exceeded 7 degrees and quickly came back to 0-1 degrees. The rest of the engine seemed in good shape, too. What else should I look into before deciding it it for us? The dealer said no modifications have been done to it such as head bolts, etc, but they did replace both batteries and 2 injectors (for cold start issues). It has 152,000 miles. Would major issues already have occurred?