Thanks Joe, not sure why they're referring to the gearbox as a transaxle, which it isn't, plus they suggest I should call the local distributors for expert advice. Given that these are listed as Halfrauds and B&Q, I don't think I'll bother with that! From Peter's recommend, I'll likely go with Opie and what they suggest, although I'll choose Castrol if there is an option, rather than the Fuch brand which they recommended...