Hello I have been thinking of buying a 7 series with one of these v8 enigens in it, But many of the cars ive seen have had thier engines replaced at 30 to 40 thousand miles. I don't quite know what to think of this since my oil burning 528 e has 170,000 on one engine. What I am trying to say is, would buying a older 740 be a good idea? If so what shood i look for. Thankyou.