How often should I replace the spark plugs in my Vauxhall Movano?

I have a 2017 Vauxhall Movano and I was wondering how often I should replace the spark plugs? I've been told different things by different people and I'm not sure who to believe.

It is recommended to replace the spark plugs every 30,000 miles or every 3-5 years, whichever comes first. This will ensure optimal engine performance and fuel efficiency. I would also suggest checking your owner's manual for specific recommendations for your model and year of Movano.

If you notice any of these signs, it's definitely time to replace your spark plugs: difficulty starting the engine, poor fuel economy, misfiring or hesitation while accelerating, or rough idling. Don't wait too long to replace them as it can lead to more serious engine issues.

Based on my experience with Vauxhall Movano, I would recommend replacing the spark plugs every 40,000 miles. However, if you drive in harsh conditions like frequent stop-and-go traffic or extreme temperatures, it may be necessary to replace them more frequently.