- The rubber boots crack after 150K or so, and they are cheap.
- The ignition coils: replace them only when they go bad. Best is to buy a few used coils on ebay and leave them in the trunk as spare. You can swap them in the middle of nowhere w/o any special tool.
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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