Mr2raw
Well-Known Member
- Joined
- Feb 26, 2020
- Threads
- 21
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- 86
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- Location
- California
- Vehicle(s)
- 2017 Mustang GT Premium California Special
- Thread starter
- #1
Hey guys,
I have a 2017 5.0 CS, and I am looking to change my diff fluid soon. I have a few questions before getting started.
1. From reading on forums and groups, it seems like AMSOIL is the preferred gear oil. However, AMSOIL only makes the 75w90 and the 75w140 for the s550, while the owner's manual calls for 75w85 Motorcraft. My car is a daily driver. Which weight should I go with? And will it matter that it is not the same oil spec as suggested by OEM?
2. Let's say if I go for this :
https://www.amsoil.com/p/severe-gear-75w-90-svg/?code=SVGQT-EA#pills-home_0
I believe I would still need to buy the friction modifier and add it? Will it matter what brand of friction modifier I use if I decide to use AMSOIL.
3. Is there an order in adding friction modifier and the gear oil? Or it does not matter?
4. Owner's manual calls for 3.2 pint of gear oil to be added. Do we always add 3.2 pint? From reading, most people just add gear oil until it starts dripping from the fill hole. Which method should I go with? From most people's experiences, if adding until the fill hole starts dripping, is it usually less than 3.2 pint or over 3.2 pint or exact? If filling somehow less than 3.2 pint, is it still necessary to add the full 4 oz of the friction modifier or will an adjustment need to be made?
5. There are other options out there that have friction modifiers included in the oil mix already. How would I know that mix specifically will work? Just go by oil weight?
Thanks guys
I have a 2017 5.0 CS, and I am looking to change my diff fluid soon. I have a few questions before getting started.
1. From reading on forums and groups, it seems like AMSOIL is the preferred gear oil. However, AMSOIL only makes the 75w90 and the 75w140 for the s550, while the owner's manual calls for 75w85 Motorcraft. My car is a daily driver. Which weight should I go with? And will it matter that it is not the same oil spec as suggested by OEM?
2. Let's say if I go for this :
https://www.amsoil.com/p/severe-gear-75w-90-svg/?code=SVGQT-EA#pills-home_0
I believe I would still need to buy the friction modifier and add it? Will it matter what brand of friction modifier I use if I decide to use AMSOIL.
3. Is there an order in adding friction modifier and the gear oil? Or it does not matter?
4. Owner's manual calls for 3.2 pint of gear oil to be added. Do we always add 3.2 pint? From reading, most people just add gear oil until it starts dripping from the fill hole. Which method should I go with? From most people's experiences, if adding until the fill hole starts dripping, is it usually less than 3.2 pint or over 3.2 pint or exact? If filling somehow less than 3.2 pint, is it still necessary to add the full 4 oz of the friction modifier or will an adjustment need to be made?
5. There are other options out there that have friction modifiers included in the oil mix already. How would I know that mix specifically will work? Just go by oil weight?
Thanks guys
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