Casteu set a time of an hour 39 minutes 42 seconds, 1:09 faster than Pain and 3:25 than Alessandro Botturi.
Casteu is now 1:15 behind fellow Yamaha rider Pain overall with KTM's Cyril Despres 6:07 off the pace after finishing fourth on the stage.
With 25 riders within an hour of the leader, the bike standings are remaining compact.
Stage five result
1. David Casteu (FRA/Yamaha) 1 h 39:42
2. Olivier Pain (FRA/Yamaha) 1:09
3. Juan Pedrero Garcia (ESP/Ktm) 2:58
4. Alessandro Botturi (ITA/Husqvarna) 3:25
5. Cyril Despres (FRA/Ktm) 4:07
6. Stefan Svitko (SVK/Ktm) 4:40
7. Francisco Lopez Contardo (CHL/Ktm) 4:47
8. Helder Rodrigues (POR/Honda) 4:52
9. Alain Duclos (FRA/Sherco) 5:01
10. Yvan Jakes (SVK/Ktm) 5:45
Standings after five stages
1. Olivier Pain (FRA/Yamaha) 11 h 51:29
2. David Casteu (FRA/Yamaha) 1:15
3. Cyril Despres (FRA/Ktm) 6:07
4. Ruben Faria (POR/Ktm) 13:34
5. Jordi Viladoms (ESP/Husqvarna) 13:36
6. Francisco Lopez Contardo (CHL/Ktm) 13.39
7. Alessandro Botturi (ITA/Husqvarna) 14:00
8. Jakub Przygonski (POL/Ktm) 19:00
9. Stefan Svitko (SVK/Ktm) 20:45
10. Daniel Gouet (CHL/Honda) 22:44
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