What are the most common issues with a Ford Galaxy engine?

I'm looking to buy a used Ford Galaxy, but I've heard about some engine problems. What are the most common issues I should look out for and how can I prevent them?

The Ford Galaxy is known for issues with the timing chain tensioner, which can lead to engine failure. To prevent this, make sure to have the timing chain checked regularly and replaced if needed.

Another common issue is with the EGR valve, which can become clogged or fail altogether. To prevent this, make sure to have the EGR valve cleaned or replaced as recommended by the manufacturer.

Some Ford Galaxy models also have issues with the turbocharger, which can fail due to oil starvation. Regular oil changes and using high-quality oil can help prevent this.