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Regular servicing is important for health and to maintain the system working effectively. Up to 15% of the refrigerant gas will be lost annually.
Synthetics and semi-synthetics give improved performance at high temperatures and support extended standard drain intervals.
Catalysts often last 10 years, but actual life depends on mileage and engine tune. 50,000 miles is a more reasonable benchmark.
We can’t provide detailed extracts from manufacturers’ workshop manuals. The vehicle handbook will include basic service interval information