front and rear axle oil changes

[Foutrack]

Hello everyone,
For the front and rear axle oil changes I again have 2 opinions, the addition of an MS-10111 type additive is only on the rear? or both?
Thanks in advance

 

[duderz7]

Rear only, and only needed if you have a trac-lok. You'll be able to tell once you've removed the diff cover, just look for pictures on the interwebs. I also suggest a lube locker gasket.

 

[Foutrack]

Merci pour l'info