Your best bet is to call Merlin at St Charles Isuzu 1-800-727-8066. He is a dealer but he gives us a discount with free shipping. Mention that you were sent from the Vehicross.info site. Many of us buy our parts from him.
Check those windows, Cd player (if it is stock), check to see if the Abs light in on or any other warning light for that matter is illuminated, take her out and listen for unusual sounds at high speeds and low (also during coasting), ask how often the owner serviced (or cleaned) the egr and pcv (they can cause excessive oil consumption). Ask if the timing belt has been replaced (should have been done by 115K).
Others can chime in with other ideas.
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