F250 rear axel oil

[MIKE IN lINO III]

I want to put synthetic oil in my rear axel, I know there was a post on the subject but a search came up blank.

What weight can I use and can I put it in the front as well?

Mike

[efgh]

I bet the oil man will heck in here, Amsoil is the anser.

[Farley]

it should tell you in your owners manual.

[ChuckN]

Correct me if I'm wrong, but I believe Ford recommends synthetic differential oil. My previous '97 F150 required it. I would take a peek at the manual to get the specs for your truck, it will state exactly what you need.

[Scott K]

75w140 is synthetic, that is what ford recommends, depending on the year. If it is an older truck it would be 80w90, non synthetic. But you can put synthetic in it.

[theoilman]

Almost all full sized Fords 1997 and newer take 75W-140 must be synthetic in the rear diff. (Mustangs and Crown Vics up through 550s.) None use 75W-140 in the front diff. Yes, you need 2 different gear oils for the same truck! (Thanks Ford) Most use 75W-90 in the front. Not only is AMSOIL better than the Ford branded, but last I checked AMSOIL is actually lower cost. AMSOIL 75W-140 Suggested retail $14.65 per quart, Preferred Customer wholesale $11.45

Most F250s will need 4 quarts (around 3 1/2 to fill).

[Black_Bay]

Don't forget the friction modifier if it's a locking differential.

[Scott K]

I dont know if its better than fords oil, but I believe you are right Amsoil is cheaper!

[DinkADunk]

You don't need to add a friction modifier to Amsoil Severe Gear unless you notice chatter. The Amsoil has a friction modifier package already in it.

[MIKE IN lINO III]

Any one know where I can get the 75w-140?

I went to the man mall and they had the 75w-90 not the 140.

Mike

[Scott K]

Ford dealer will have it!

[theoilman]

You can order direct on-line through any link in any of my posts: AMSOIL 75W-140.

It ship direct to your door via UPS - most here on FM from Superior, WI distribution center in 1 or 2 business days.

[MIKE IN lINO III]

Thanks Oilman,

I'd rather not have to pay shipping on something that should be available locally.

Mike

[theoilman]

You always pay shipping - it is just included in the price when you buy it off the shelf. Compare the complete price.