2003 4,4i E-53 all sounds are ok..but price alwaise convinsing..I have 52K miles.
How often do you have to replays set of spark plugs ??

Brand New Set of Platinum 4 Electrode Spark Plugs .One set is required for 8 cylinder spark plug job. Made by: BOSCH


eBay Motors: BMW E52 E53 X5 Z8 V8 - Platinum Spark Plug Set (item 390044653652 end time May-15-09 22:00:57 PDT) (ebay find)
regards