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Jun 12, 2021 | 05:47 AM

DISLFVR

Thread Starter

Locomotive breath

Joined: Jan 2006

Posts: 1,354

Likes: 1

From: Mid Oh. Ponderosa

Royal purple MaxGear

I'm going to change the rear end fluid soon and wondering if anyone uses this in they're F-150's. I have some left over from my super duty..

Jun 12, 2021 | 06:25 PM

GABAR

Lead Driver

Joined: Dec 2016

Posts: 5,650

Likes: 243

From: GA

Quote:

Originally Posted by DISLFVR

I'm going to change the rear end fluid soon and wondering if anyone uses this in they're F-150's. I have some left over from my super duty..

Are the specs the same?

If so, it really doesn’t make any difference.

With that being said, if the stock Motorcraft fluid has served you well, why change.

Jun 12, 2021 | 09:12 PM

cps

Laughing Gas

Joined: Mar 2008

Posts: 967

Likes: 7

From: coquitlam,BC

Quote:

Originally Posted by DISLFVR

I'm going to change the rear end fluid soon and wondering if anyone uses this in they're F-150's. I have some left over from my super duty..

I use Amsoil 75-140 synthetic.

Jun 13, 2021 | 01:42 PM

A/Ox4

9 ECHO 1

Joined: Aug 2009

Posts: 12,467

Likes: 58

From: Missouri

I'm all for good synthetic oils as motor oil. I'm sure RP makes good stuff (although I've never looked into it). But diff fluid isn't where I would waste money on RP. The Motorcraft stuff is great, and it lasts a long time. I wouldn't see the need to spend the extra money on RP.

Jun 13, 2021 | 03:45 PM

JKBrad

Moderator

Joined: May 2005

Posts: 8,226

Likes: 1,240

From: San Antonio, TX

I don't understand the hype of boutique oil products. The mainstream companies make stuff that is just as good and you can find it almost anywhere.

Jun 13, 2021 | 05:23 PM

DISLFVR

Thread Starter

Locomotive breath

Joined: Jan 2006

Posts: 1,354

Likes: 1

From: Mid Oh. Ponderosa

Just out of curiosity, is why I asked. I had a unopened quart and about a third of one left from the dually I had.. The main reason a lot of us used it is because the friction modifier is already in it, didn't need to add it as with the motorcraft stuff....But after looking into it further the friction modifier isn't needed for my F-150 so I will go with the Motorcraft 75w140 syn.