- I have 130K miles (same as your mileage) and my boots are still factory.

- Don't use Febest, it is of unknown quality.
- Stick to GKN, which is the OEM mfg. I don't know if you can get GKN boot in Australia, buy try ebay Australia.
- Or try FCPEuro in the USA.

- Safety first, use jack stands, and place the tire underneath the engine area.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT