Yes you will be fine A3 is for extended service intervals
This may help
ACEA
This is the European equivalent of API (US) and is more specific in what the performance of the oil actually is. A = Petrol, B = Diesel and C = Catalyst compatible or low SAPS (Sulphated Ash, Phosphorus and Sulphur).
Unlike API the ACEA specs are split into performance/application catagories as follows:
A1
Fuel economy petrol
A2
Standard performance level (now obsolete)
A3
High performance and/or extended drain
A4
Reserved for future use in certain direct injection engines
A5
Combines A1 fuel economy with A3 performance