It can't be. The ad clearly states it's a 3.5L engine in it. :grin:
And why would it need an oil change every 2500 miles, unless it was driven HARD. With that many miles it is probably mostly highway/commuting miles which are not hard on the engine. That mileage is also 16,000 average miles a year. Meaning you'll have to believe he had time to take it to a service station for an oil change every 7 weeks?