Royal Purple vs. Motocraft

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11-23-2009, 03:44 PM

Shaunmac9128

6th Gear Member

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Location: RI

Posts: 5,453

Royal Purple vs. Motocraft

I'm going to be swapping in an 8.8 soon and while I have it out I'm going to change the gear oil. With a stock diff and gears do you guys prefer RP or Motocraft. just looking for some opinions. Thanks.

11-23-2009, 04:55 PM

WannaBeGearHead

Go Texas!!!

Join Date: Jul 2009

Location: Lincoln, NE

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A lot of people use RP, have heard some same Mobil 1 and some others say just any gear with the right weight will do.

11-23-2009, 05:00 PM

Shaunmac9128

6th Gear Member

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Join Date: Nov 2008

Location: RI

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What is the right weight for a stock 8.8?

11-23-2009, 06:16 PM

BIGMAC9940

1st Gear Member

Join Date: Oct 2006

Location: Oklahhoma

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dont remeber what the correct weight is but i have used many of royal purples products and have always been very happy with them. i would say go with the royal purple.

11-23-2009, 07:06 PM

WhiteFoxGT

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Location: Delaware

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Cant go wrong with either. Go with whatever is the most readily available to you.. Right weight is 75-140

11-23-2009, 07:10 PM

StriderTacticaL

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Join Date: May 2008

Location: Santa Monica, CA

Posts: 1,842

I second the 75W140....

Thats what I used when I had my 3.73's put in....then when my rear end blew, I had a 31 spline setup put in with 4.10's and again used RP 75W140.