gear oil weight and how much?

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12-19-2009, 07:48 AM

#11

03BottleFedGT

3rd Gear Member

Join Date: Jun 2006

Location: GA

Posts: 964

if you use royal purple you do not need friction modifier it already has it in it. if you use another brand yes you will need modifier. 75w90 3 quarts

12-19-2009, 08:44 AM

#12

cliffyk

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Join Date: Dec 2006

Location: Saint Augustine, FL

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Quote:

Originally Posted by Chris98Gt

Do you not need the friction modfier with the synthetic gear oil?

It depends, most brands do not, but some do--check the manufacturer's web sites. However in general synthetics do not need the FM as they are sufficiently "slippery" already...

12-19-2009, 10:06 AM

#13

Chris98Gt

3rd Gear Member

Join Date: Apr 2007

Location: Georgia

Posts: 931

Never knew that, thanks for the info. I don't actually use the synthetics, but was just wondering since noone mentioned it.

12-19-2009, 02:44 PM

#14

Pubydingus

1st Gear Member

Thread Starter

Join Date: Aug 2009

Location: Washington

Posts: 62

so either weight looks like it wll work is what im getting out of this...

12-19-2009, 02:55 PM

#15

03BottleFedGT

3rd Gear Member

Join Date: Jun 2006

Location: GA

Posts: 964

no 75w90 is what you need

12-19-2009, 05:08 PM

#16

cliffyk

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Join Date: Dec 2006

Location: Saint Augustine, FL

Posts: 10,938

Quote:

Originally Posted by 03BottleFedGT

no 75w90 is what you need

The Ford owner's manuals, and shop manuals, from 2001:

to 2010:

All recommend 75W-140 gear oil, with 4 oz of friction modifier meeting Ford spec EST-M2C118-A, if using the Motorcraft SEA 75W-140 Rear Axle Lubricant.

2001: