What are common issues with the Vauxhall Astra's engine?

I have recently purchased a Vauxhall Astra and it seems to be having issues with the engine. I've noticed unusual noises and a decrease in performance. What could be causing these problems and how can I prevent them?

The most common issue with the Vauxhall Astra's engine is the presence of carbon deposits. These deposits can cause knocking sounds and decrease engine performance. To prevent this, it's important to regularly use a high-quality fuel and add fuel additives to clean the engine.

Another potential issue could be a clogged air filter. This can lead to poor air flow and reduced engine power. Make sure to replace the air filter every 12 months or 12,000 miles to avoid this problem.

In addition, it's important to regularly check and change the engine oil according to the manufacturer's recommendations. Old or dirty oil can also contribute to engine issues.