put a racing oil in it, that'll sort it. the only way to fill the gearbox is through the dipstick tube. i have a home made filler which i made for our 2 subaru's, he can borrow it if he's stuck.
take it up to dyno demon in neston, say sean from cadscoobies recommended.
also tell your lad to join cads on www.cadscoobies.com
loads of info on there, they're a friendly bunch too.