Old diff oil

[Jellyfishfields]

FWIW, if it were me I'd spend the few quid on new oil, then pour the old oil into my can of black waxoyl and paint it onto every exposed metal surface whenever I did any work on the car.

I wouldn't be doing that with gear oil, it stinks.

Seriously?
I sit on the inside and that's on the outside. No problem.

If it's the usual H.P. oil with sulfur in it then yes, seriously. A few drops on the garage floor and it stinks for days. No way would I be painting that stuff anywhere, it reeks.

 

[kis]

6 year old oil is better than 17 year old oil.

Agreed. Plus you can always flush it again in a years time (with brand new stuff) so you know it's squeaky clean.

 

[SonnyA85]

FWIW, if it were me I'd spend the few quid on new oil, then pour the old oil into my can of black waxoyl and paint it onto every exposed metal surface whenever I did any work on the car.

I wouldn't be doing that with gear oil, it stinks.

Probably be an improvement for him though