Manufacturer's KNOW-HOW stretches back more than 30 years; Product with 1 to 3 filaments OFFERING A TECHNICALLY BROAD RANGE and a WIDE SELECTION OF PRICES.
ISO 11565:2006 (2006-12-15) - Test methods and requirements
ISO 28741:2013 (2013-11-15) Spark plugs and their cylinder head housings - Basic characteristics and dimensions
ISO/TR 15409:2002 (2002-04-01) - Heat rating of spark plugs
To keep the engine in perfect working order, spark plugs should be checked at 30,000 to 60,000 km intervals (to manufacturer's recommendations).
Faulty spark plugs can cause: