GT3 & GT3 RS
Porsche recommends this additional maintenance for race track use.
This service is recommended for every 4,200 miles (7,000 km) of track use (cumulative). Now don't panic, this service interval is only required for race usage. To put that in perspective, Sebring International Raceway is 3.7 miles. So that would be about 1130 laps at Sebring!!