Have hit 10,000kms in Highline 140TDI and first fill of adBlue. Got a price from dealer - $82 regardless of amount required. Made sure it did not void the warranty and was replied to in writing and so filled up at local service station for $8.70. Got at 90 cents a litre self fill. Only precaution taken was a plastic bag and rag under the filler to eliminate any spill.