Cool! Yet another great writeup.

What's the purpose of the freeze plugs; as you asked in the other thread, why have a hole that's plugged….and never, ever opened?

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'99 528i ('98/12 build). 174,000km BY29428/Royalrot
Breaking My Wallet since 2009
Mods: Stoptech SS brake hose, 280piece toolkit resting on trunk floor, Beisan VANOS seals
'99 540i (grandfather's)