My cars going into the garage in the next week or 2 to have some repairs and work done. AUX belt is got a tear in it so going to get all the belts, pulleys and water pump done (on 80km and i believe its still the original ones, but im really not sure) so just going to get that done. But the main reason for this post is the rear diff has a minor leak, so im ordering the seals for it but whats the best fluid to use for the rear diff, well what do you guys recommend? Also is it worth while doing the AYC whilst im there or am i just going to far?

Thanks for any advice!!