ep 80 vs sae 80

[Al Housman]

Hi. Just bought some 80 GL4 oil for the front diff but realised it's EP80, not SAE 80. Can I use it or will it attack the internals?
Cheers

[..lee..]

Can't see a problem myself. Gl4 75/80 in the box and gl5 75/80 in the front diff. Gl5 oils are belived to damage the Syncro rings in the box.

[max and caddy]

Same...no real need for different oil up front either..same hypoid gears..running cooler..

[Al Housman]

Thanks both for that. My concern was that EP gear oils seemingly has additives which may attack phosphor bronze.

[max and caddy]

Gl5 was the stuff that could of had the nasty corrosive aditives in once upon a time...think it's old news now anyway that stuff but stick with gl4 ..still EP, still hypoid, but not gl5 exept up front of you like as there's no syncro cones to damage in there anyway.