How to improve the performance of my Vauxhall Insignia's engine?

I have noticed that my Vauxhall Insignia's engine is not performing as well as it used to. It feels sluggish and doesn't have the same power as before. What could be causing this and how can I improve its performance?

There could be several reasons for the decrease in engine performance. It could be due to clogged air filters, dirty fuel injectors, or a problem with the spark plugs. I would recommend getting a tune-up and having a mechanic check these components to ensure they are working properly.

Another possible cause could be a faulty mass air flow sensor. This sensor measures the amount of air entering the engine and adjusts the fuel injection accordingly. If it is not functioning properly, it could lead to a decrease in engine performance. It is best to have a mechanic diagnose and replace this component if necessary.

Have you been keeping up with regular oil changes and using the recommended oil for your Vauxhall Insignia? Old or incorrect oil can also impact engine performance. Consider getting an oil change and using a high-quality oil to see if that makes a difference.