Can I use 75W90 ?

[sHERM]

Specs say SAE 90 Hypoid oil. all I can find is 75w90 or 80w90.

Whats the diff?

 

[Eddie]

Use the 80w90 GL5 gear oil. The GL5 is used for Hypoid or worm gear type gearing.

 

[BigCahuna]

My old Honda motorcycle spec'd 80-90 wt Hypoid oil for the rear end gears.The book said to use 80 wt in winter, 90 wt for summer, or 80/90 for year round use. The bottle said it had a GL-5 rating . I found it at my Napa store. Most oil sold today isn't refered to as Hypoid oil, and the guys I asked had a blank look when asked for Hypoid oil.,,

 

[ARCOgraphite]

"Whats the diff?" - that IS hilarious!

If the diff is on the f150 and you are in tampa I would say go with the 80w-90 GL5.

Do you have traction loc? IRC this requires no friction mods?

 

[salesrep]

Yes.
Diff?, simply put, is that the 75-90 flows like a 75 weight at start up, both are 90 weight during machine operation.

 

[ABerns]

Yes, either 80w90 or 75w90 would work, provided they are hypoid gear oils.

Although honestly, we hear so many stories on this board (and other forums) of people using X instead of Y and having "no issues", I doubt you will notice as well.

 

[justinf89]

Pep boys sells hypoid gear oils around here.

 

[mechtech2]

A multi grade in 80-90 or thereabouts is better than a straight 90.
Really.

 

[artificialist]

I use 80w90 conventional or 75w90 in all differentials that call for SAE90. It works fine.