Hey all....need some advice on a purchase of a used 2006 x5 4.4i. Below are the details, appreciate any advice, tips, suggestions, etc.

I currently have a 2003 x5 3.0. Paid off, 142k miles, looks and runs good...I take care of it. Got a great mechanic, and got some mechanical needs that are a bit costly. A/C issues & A/C exhaust fan, rear brakes, a few preventive maintenance suggestions as well. Prob run me up to 2k. Its been a great maintenance friendly vehicle for over 7 years now.

Saw a great deal on a 2006 4.4i, 75k miles, sports package & nav from an independent dealer priced at $16.5k. Dealer offering me 4k for my car, and 1k off the purchase price, totaling $11.5k. Issues I noticed, include 1 tire with a screw in it, possibly 2 others that are almost ready to be replaced. That oil change indicator(5 green bars) in the dash is on the yellow inspection bar/light. Ext/Int looks great. Comes with a Buyer Shield 3mo/3000ml limited powertrain warranty. Carfax is clean. I tried playing with all the buttons and nav and seems to all be working.

As of yet, I did not do any type of pre purchase inspection, because I just assumed some type of inspection was done because of the Buyer Shield warranty. This was purchased at an auction and I believe most do some type of inspection.

Pricewise - I am happy with the 4k for my car, I asked for 5k, but because of the maintenance items mentioned above for the 2006, he gave me 1k off the purchase price. KBB for my 2003 is about 6-7k. KBB for the 2006 is about 18-20k.

Whats bothering me is low price on the vehicle as compared to the KBB value. I do expect to pay up to 2k in immediate maintenance, which I am fine with (if I stick with the 2003, need spend 2k anyway).

I am assuming if my mechanic finds any pressing mechanical issues on the 2006, depending on what they are, I can execute the Buyer Shield limited powertrain warranty.

Appreciate any feedback, input, advice, suggestions based on the above or anything related. I love the X5 and just looking for an affordable upgrade. The 2006 4.4 is beautiful and the V8 sounds and feels amazing.