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Royal Purple Max Gear 75w140 Gear Oil

Market Price $22.99 You Save 16% ($3.78)
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$19.21

FREE Shipping on orders over $49

  • Item 45006
  • MPN# 1301

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    Features, Video & Details

    • Fully Synthetic
    • Friction Modifier Included
    • Protects Against Wear
    • Reduces Gear Whine
    • 75w140 Weight
    • 8.8" Ford Rear Ends Require 3 Quarts
    • For 1979 to 2019 Mustangs

    Review & Installation Video

    Review & Install Video

    Pure Performance. Maximize performance from your Mustang's drivetrain with Royal Purple Max Gear oil. This fully synthetic oil is the perfect complement to new gears, lubricating better and ensuring your differential keeps working its best whether it has gone a thousand miles or a hundred thousand.

    Protect Your Investment. Made with Royal Purple's innovative Synslide® additive, Max Gear oil is perfect for upgrades or routine service. It's the gear oil of choice for greater wear protection and lower temperatures for every car, from daily drivers to track-day toys. It prevents corrosion and meets all warranty requirements, so adding Royal Purple Max Gear oil is great for peace of mind when it comes to your Pony.

    Includes Friction Modifier. Unlike other oils, all viscosities of Max-Gear® are formulated with hypoid friction modifiers necessary for use in clutch or cone type differentials. No additional additives are necessary.

    Application. Royal Purple Max Gear 75w140 weight oil is recommended for use in 1979 to 2019 Mustangs and is compatible with other oils. Three (3) quarts of gear oil are required to fill a 8.8" Ford rear end.

    Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 Details

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    • (1) one quart bottle
    Installation Info
    Tech Specs
    Will it fit my Mustang?
    • Boss 302 - 12, 13
    • Bullitt - 01, 08, 09, 19
    • Cobra - 93, 94, 95, 96, 97, 98, 99, 01, 03, 04
    • Cobra R - 93, 95, 00
    • EcoBoost - 15, 16, 17, 18, 19
    • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19
    • GT350 - 15, 16, 17, 18, 19
    • GT350R - 15, 16, 17, 18, 19
    • GT500 - 07, 08, 09, 10, 11, 12, 13, 14
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 79, 80, 81, 82, 83, 84, 85, 86
    • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17

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    Questions & Answers (14)

    5 Top Rated Questions

    2003 Mach 1. One of your answers for a different year said friction modifier was needed with Royal Purple 75W-140. Royal Purple description says otherwise. What's the right answer?!!

    • The royal purple fluid does come with the friction modifier already included in the fluid so extra would not be needed on those vehicles, however, if doing a full fluid replacement and reseal or an overhaul (removing the cover) it is required to soak the clutches in the friction modifier fluid separately from the royal purple fluid to ensure a full seat with the clutches.

    Helpful (3)

    I am wondering ....why is it that it says I need 3 quarts of gear oil for my 8.8 rear end? But the Gear Kit only includes 2 quarts and friction modifier, which it also says comes in the Royal Purple Gear oil ? I just ordered 3 qts. and seems as I may end up with a spare!

    • As per the manual the 8.8 rear takes 4.25 pints so you will need the 3rd quart for that extra 4oz. Do not over fill or you will have fluid coming out of your axel seals sooner or later. Happy Motoring!

    Helpful (2)

    For a 2016 mustang gt performance package how many quarts do you need and do you need to add friction modifier

    • A 2015-2017 Mustang will require 2 quart bottles to fill, although not all of the gear oil will be used. You will also need 3-3.5oz of friction modifier.

    Helpful (1)

    Buying a 2018 gt 3:15 rear end for my 2015. How much fluid is needed? Are the 15-17 same as 18-19?

    • You will need 3 bottles of gear oil, though not all of the oil will be used.

    Helpful (0)

    What is the difference between this and the RP 75w90 Gear Oil? I'm asking in reference to a 2018 GT Automatic

    • A 75w90 will be thinner at higher oil temperatures than a 75w140. Both are the same thickness at lower oil temperatures. The 75w140 is said to have a wider viscosity range, when more accurately it would be a wider temperature range.

    Helpful (0)
    Post Your Question
    9 More Questions
    What kind of differential gear oil and how much for 2014 mustang gt track pack. Do I need FM with the Torsen differential? 1 answer
    How many would be needed for a 2016 Mustang GT? 1 answer
    2001 bullitt stock gears what type of gear oil should i get? Car has 170,000miles 1 answer
    how many quarts will my 2005 v6 require? 1 answer
    For my 2009 GT how many quarts do I need plus the friction modified 1 answer
    How much gear oil and friction modifier for 2007 Mustang GT? 1 answer
    how many quarts does the rear differential take to fill up 2016 Mustang and the weight of oil the stock one take thank you 1 answer
    For a 99 gt 8.8 diff. Would 2 quarts and a bottle of friction modifier be enough or would I have to make that 3 quarts and the modifier? 1 answer
    Is a Friction modifier really needed? I have heard varying opinions on the subject. I know it says it has all modifiers necessary already added, but some folks have told me that they still add it. I have a 2006 v6 that I'll be swapping an 8.8" rear w/4.10s into. I just want to be sure I take all of the necessary precautions to ensure that my almost new take off rear has a long life. Thanks! 3 answers

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    Customer Reviews (69) Write a Review

    Overall Rating 5

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Performance Gain 4.510204 4.5
    • Fit 4.96 5.0



    • 5/5

      Installation Time: Afternoon

      October 20, 2018

      GaryP

      I got product too change the gear oil in my 2011 Mustang Gt

      GaryP

      Year: 2011 Submodel: GT

      Helpful (1)

    • 5/5

      September 04, 2018

      Great

      Worth the buy. Needed for the install. I put in higher rear gears

      Joshua

      Year: 2012 Submodel: V6

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      September 02, 2018

      2012 GT

      So far so good...rear is pretty quiet and was happy to get the old fluid out! Added the ford friction fluid to be safe! Very happy with this product! Took an afternoon due to changing the rear end cover as well! Now it will take less than an hour!

      PaulP

      Year: 2012 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      August 24, 2018

      Royal Purple A

      Its the best grade product available for automotive lubrication.

      TimothyW

      Year: 2006 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      August 03, 2018

      Gear oil

      This is the best gear oil on the market love this stuff worth every penny.

      MichaelF

      Year: 2018 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      May 27, 2018

      Works well

      Seems to be doing what it’s suppose to do. No complaints yet, have 1500 miles on the change and no complaints

      Brian

      Year: 2008 Submodel: GT500

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      May 23, 2018

      great product

      2005 mustang GT with 70,000 miles. very happy. I live in the Berkshires . and the hills are not problem.

      mike

      Year: 2005 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      May 22, 2018

      Royal Purple Max Gear 75w140 Gear Oil

      Best gear oil in my opinion. I have used this project many times with great results.

      2007Vert

      Year: 2013 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      March 06, 2018

      Superior Gear Oil

      Been using Royal purple in my engine since I got my car in 2014 so when I changed my differential cover gear oil I went with royal purple. Just feeling and smelling it compared to what Ford uses you can tell there is a difference. Can't say I noticed any gains but I know I moved up to something better

      Logan

      Year: 2014 Submodel: V6

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      February 25, 2018

      Excellent Gear Grease

      The best gear Lube on the market today. My car runs all synthetic when available. I only use Mobile One Oil as well.

      Bird00

      Year: 2008 Submodel: Bullitt

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      November 29, 2017

      Seems to be good product

      Not enough time to test it, a destroyed new bearing force me to re open my rear axle and change oil ...

      LaurentH

      Year: 2010 Submodel: GT

      Helpful (6)

    • 5/5

      November 07, 2017

      Gear oil

      Great oil. No additives needed and definetly worth the money!

      JustinH

      Year: 2004 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      September 20, 2017

      Great choice!

      Royal Purple is one of the best products on the market. After changing my gear oil I could feel it was smoother and quieter. Thanks AM!

      DarrellS

      Year: 2007 Submodel: GT

      Helpful (5)

    • 5/5

      September 12, 2017

      The brand i always go with

      Got ford racing 3.55 gears so i needed new oil. i do alot of highway driving so i got the heavy weight and i have zero whine and the diff works great.

      Snoggatog

      Year: 2014 Submodel: V6

      Helpful (5)

    • 5/5

      August 30, 2017

      Perfect addition

      Nice quality and looks 100x's better then the open 12v plug

      ZachP

      Year: 2006 Submodel: V6

      Helpful (5)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      July 22, 2017

      Purple

      shop installed no noise heard from rear end worked well and wasnt too expensive either

      TheShado

      Year: 2007 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      May 03, 2017

      Perfect

      Best brand in the market for a good price, perfect to maintain your car always smooth at 100

      Lucavenice

      Year: 2014 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      April 14, 2017

      Another great RP product!

      Immediatey noticed the difference after letting my car warm up and idle down. Much smoother gear engagement and no more faint gear whine. I was advised to let the fluids warm up a little bit longer being that it's a significantly heavier weight than oem. That hasn't been a problem since I'm already in the habit of letting the engine warm up completely. If you beat on your car every time it's on the road, I do recommend this gear oil for your differential!

      wolfofspring

      Year: 2015 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      March 24, 2017

      Great oil!

      This stuff is second to none. From now on I'll only use Royal Purple. Thanks AM!

      Joe

      Year: 1989 Submodel: LX

      Helpful (4)

    • 5/5

      March 17, 2017

      Royal Purple Max Gear 75w140 Gear Oil

      I run Royal Purple on all my cars. The car clearly runs better with this oil over others. I highly recommend it!

      AK

      Year: 1987 Submodel: GT

      Helpful (4)