Hey 4.8IS owner. I am currently owning 03 4.4 Sport package and love it. I am seeing 06 4.8IS with 63,000 miles for sale and would love to check it out. What are the issue in this engine? I know the air suspension and smoke is the the known issues what else are there?

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2003 X5 4.4i w/ Sport Pkg, Cold Weather Pkg.
2010 X5 4.8i w/ Sport Pkg at 19,000 miles