Gearbox and rear drive change intervals

[Orinoco]

I've always changed oils annually, but wondering why for the gearbox and rear drive. Rear wheel drive cars I've owned seem to have had sealed for life units with no specific change intervals.

Why do the boxer engine intervals need to be annual

 

[Udders]

Dunno, but because the oil is soooo cheap I change both of mine every year. Don't care if I'm daft doing it either.

 

[Comfy Old Boots]

I guess it gives you an opportunity to look for signs of final drive failure.

 

[MarkShelley]

http://www.ukgser.com/forums/showth...-change-the-oil-in-the-rear-diff-and-gear-box