OK, thanks for the reassurance chaps - I could just be panicking over nothing. It's certainly driving and behaving as normal.
The coolant was genuine Audi stuff so nice and pink
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor
)
1988 E30 Coupe - Royalblau Metallic
2003 S4 Avant - Light Silver Mettalic
2016 S5 Coupe Black Edition - Ibis White