Why does the Audi 80 use hydraulic lifters?

I noticed the Audi 80 has hydraulic lifters instead of solid lifters. What is the advantage of this design and how does it improve the performance of the engine?

Hydraulic lifters use oil pressure to maintain valve lash, allowing for smoother and quieter operation compared to solid lifters. They also eliminate the need for frequent valve adjustments.

The use of hydraulic lifters reduces valve train weight and friction, resulting in improved engine efficiency and power output. It also allows for more aggressive cam profiles.

One potential disadvantage of hydraulic lifters is the possibility of oil leaks or failure, leading to compromised performance. Regular maintenance and using high-quality oil can help prevent these issues.