Why 911 GT3 engines fail and how to stop it

The 991.1 GT3 finger follower failure that is commonly found in these cars.

Premature wear and failure: the finger followers (part of the valvetrain in the 3.8L flat-six engine) can experience accelerated wear or fracture, potentially due to high-RPM stress, lubrication issues or metallurgy inconsistencies.

Symptoms and damage: ticking noises, misfires or loss of power. If a follower breaks, it can cause severe engine damage, including to camshafts, valves or lifters.

Recommendations: run only Motul 300V oil or engine oil with high zinc / ZDDP additives. Inspect the valve train, and listen to the valve train on each engine bank from the outside of the car regularly.