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I bought my 4.6is about 19 months ago with 33k miles and have about 46k on the clock right know...knock on wood I have not had any problems, although I did change ALL the fluids about 3k miles ago (coolant, trans, transfer, diffs, oil) and she's running strong. I drive in S mode about 5% of the time when I want to flick the paddles shifters around a little. I drive the X hard maybe 10-20% of the time whether I am in S or D mode.
I am also pretty anal about maintenance, I only use BMW or good quality synth fluids (Redline, Mobil 1, etc.) and I change the oil in the X every 3k-5k miles. My mechanic thinks I am nuts but I used to take of my E30 M3 the same way and I drove that car VERY hard and she never let me down! I sold the M with 110k on the clock and it was running as strong when I sold it, as it did when I bought it with 28k on it.
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