What is the milage on your car and did you service your timing chain as preventive or were there symptoms? I am thinking to service my timing chain while doing the valve cover, valley pan and cooling hoses and having 2nd thought about removing the front of the engine for the chain is PITA. I don't have any symptoms on the timing chain yet and currently at around 92k mile.

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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