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Old 06-13-2013, 08:22 PM   #1
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Gear Oil

Getting 3.55s installed Monday. Shops planning on using GL5 80/90 gear oil and some posi additive. Does this sound fine? Does the 75w140 make any difference which American muscle includes in their kit?
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Old 06-14-2013, 05:59 AM   #2
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I got me 3 quarts of Motorcraft 75W140 and a 4oz bottle of friction modifier from my local Ford dealer. You'll use about 2 1/3rd quarts.

I only used around 3 oz of the friction modifer and don't have any clutch sounds when turning.

If you use more than 4oz of friction modifer you will get 'one wheel peel'. Just saying....................
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Old 06-14-2013, 06:00 AM   #3
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Your owners manual recommends 75/140 with the friction modifier additive.

That said, depending on how you use the Mustang, and if you "have fun with it" and/or what climate you live in, 80/90 or 85/140 could be used as well. I recently changed my rear gear fluid and used royal Purple 85-140 with the added bottle of friction modifier, even though RP comes with friction modifier in its gear oil. I did this based on the recommendations of the vendor that sold it (called and asked why they only sell 75-90 and 85-140; they stated based on their testing both on the track, and on the streets, they found the 85-140 the best for that application).
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Old 06-14-2013, 06:09 AM   #4
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I must add: I don't know if the 80/90 gear oil is good or bad.
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Old 06-14-2013, 09:04 AM   #5
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Quote:
Originally Posted by Mustangs View Post
Getting 3.55s installed Monday. Shops planning on using GL5 80/90 gear oil and some posi additive. Does this sound fine? Does the 75w140 make any difference which American muscle includes in their kit?
Quote:
Originally Posted by bucko View Post
Your owners manual recommends 75/140 with the friction modifier additive.

That said, depending on how you use the Mustang, and if you "have fun with it" and/or what climate you live in, 80/90 or 85/140 could be used as well. I recently changed my rear gear fluid and used royal Purple 85-140 with the added bottle of friction modifier, even though RP comes with friction modifier in its gear oil. I did this based on the recommendations of the vendor that sold it (called and asked why they only sell 75-90 and 85-140; they stated based on their testing both on the track, and on the streets, they found the 85-140 the best for that application).
^This is correct. You can use any of the listed Gear oils, depending on how you drive your car and what climate/elevation you live in. I would recommend 75w140 Royal Purple, but that's just me!

Please let me know if you have any questions or need some assistance in the near future.

-Dan
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Old 06-14-2013, 12:02 PM   #6
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So which gear oils are not commonly used in warmer climates. I'm in Southern California and my car is garaged so it stays warm more than most. And how does these oils reflect the way you drive?
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Old 06-14-2013, 10:34 PM   #7
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The higher the 2nd number, the thicker the oil and more protection it offers. You generally go with higher numbers in warm weather and lowers numbers in cold weather (cold thickens oil and vice versa). I would not go with something as light as 80w90 when they came from the factory with 75w140.
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Old 06-14-2013, 10:36 PM   #8
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Quote:
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The higher the 2nd number, the thicker the oil and more protection it offers. You generally go with higher numbers in warm weather and lowers numbers in cold weather (cold thickens oil and vice versa). I would not go with something as light as 80w90 when they came from the factory with 75w140.
Thanks. should I have him put in the 80/90 in the break in but then change it after to the 75/140?
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