I am looking at a 2006 bmw 325i with 35,000 miles and a 2004 bmw x5 3.0 with 101,000 the only reason I am considering the x5 is because I think it would be good for my dog, but here's the deal I had a 2004 audi a4 before I bought it used with 50,000 miles and the engine broke by 70,000 miles I believe it was a really bad experience. I guess what I am saying is I don't want the same thing to happen again. I drive a lot probably like 20,000 miles a year and need a reliable car. Either past or present owners of these type of bmw's please tell me your thoughts an advice?