Why is my Audi 80 engine struggling to start when I use synthetic oil?

I recently switched to a synthetic oil for my Audi 80, but now I've noticed that the engine takes longer to start up and seems to struggle more. Is this a common issue with synthetic oil, and what can I do to fix it?

Synthetic oil is known for its superior lubrication properties, but it can also cause buildup on the starter and spark plugs, which can lead to difficulty starting the engine. To fix this issue, try using a fuel system cleaner to remove any buildup.

There could be multiple reasons for this issue, including a faulty starter or a worn out battery. It's best to take your Audi 80 to a trusted mechanic to diagnose the problem and provide a proper solution.