After Every Race Weekend (Sprint); After 3 - 4 Race Weekends (Sprint); After 20 Respectively 30 Hours Running Time; After 50 Hours Running Time - Porsche 2012 911 GT3 CUP Technical Manual

11.3. After every race weekend (sprint)

11.4. After 3 - 4 race weekends (sprint)

11.5. After 20 respectively 30 hours running time

11.6. After 50 hours running time

In addition to points in 11.2:
 Engine oil and filter change (after 'hot races'  engine oil > 140°
C)
 Check compression and pressure loss of each cylinder
 Clean/replace air filter
 Change brake fluid
 Check brake balance setting
Clean brake balance system

 Change brake fluid
 Check clutch wear
 Check wheel bearing play
 Check throttle cable route and setting
Check air-jacks for leakage and seated correctly

 Check seat and safety harness
Check fire extinguisher

 Check flywheel and pulley side rotary shaft seals for leakage
Rebuild brake calipers

 Replace fuel pumps and filter
 Overhaul dampers
Check driveshaft CV joints

Gearbox rebuild

See 5.12
Engine rebuild

See 3.9
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