Just a quick follow-up post to a year-old thread - my A8L now has the aluminium part installed, which was done at the same time as the camshaft/timing belt. It's been a pleasant relief in so far as I don't have to keep checking the antifreeze level every couple of weeks. Over the 7 year period of my ownership of this particular A8L, I'd probably filled the expansion tank up with at least 2 containers worth of antifreeze (4 litres or 8 litres in total) due to the original plastic part developing a crack.
I'd left it this long as it was manageable and I also wanted to get the new aluminium part installed at the same time as all the other timing belt work being done.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend)
2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend)
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