One other possibility is for the fluid on the bell housing is engine oil, quite possible if it's ever had a head gasket failure. The rear crank seal could be leaking. You should be able to tell if it's wet enough to pick up on your finger the difference between hydraulic fluid and engine oil is easy to spot. Check the engine oil level over a period of time and see how it fares.
Either way the gearbox is going to have to come off for a repair so you can check both the slave and rear crank seal at the same time.
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Need a T4 ?: T4 Owners Map thanks to Stevestrat ( use at your own risk)
Where?:
https://en.wikipedia.org/wiki/Tanelorn
Mods/Retrofits:
PCV vortex 'filter'; bluetooth; inline thermostat; reversing sensors; plenum spyhole ; headlamp washers ; Diy mp3 player replacing CD multichanger; FBH with remote; Headlamp washers; black/chrome front grille, rear blind; Xenon projectors
To do:
puddle lights; 2 Din cd/nav to fit; boot release button
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