http://www.ebay.co.uk/itm/FG-Zenoah-Marder-MT-Truck-Leopard-HARM-Baja-HPI-Marder-Wheels-VGC-OFFERS-/201173604465?pt=UK_ToysGames_RadioControlled_JN&hash=item2ed6e19871
Put a low offer in on these they've up for a while
Nowt to do with the wet mate the seals just leak after so many hours run time viton seals last longer thou, just think while your motors in bit best time to do it.
It's up to you thou
Really mate you should change the bearings and seals in the crank after 2 years, its not that hard a job theres tutorial vids on youtube if ya get stuck also use ddm gasket set they're really good. You'll have a new motor then;)
Ive had this battery for a couple of years a its been good an good price too;)
http://www.ebay.co.uk/itm/6V-5000mAh-SubC-NiMH-battery-pack-Twin-Lead-Vapextech-/331256169617?pt=UK_ToysGames_RadioControlled_JN&hash=item4d20680491