Differential oil and additive for LSD

[jetrep]

Has anybody with an LSD equipped differential changed their diff fluid? The manual calls for this to be completed at 36k miles for LSD equipped models. I haven't had much luck finding exactly what should be used. I don't particularly care for my dealer so I have not yet asked them.

For the gear oil itself I've found Redline 75W85 GL-5 75W85 GL-5 Gear Oil

Per the manual:
1.47 US QTS (1.4L) required HYPOID GEAR OIL API GL-5 SAE 75W/85 (SK HK SYN LSD GEAR OIL 75W85 or equivalent)*
* Be sure to inject for exclusive use of LSD when replacing Rear Differential Oil (if equipped with Limited Slip Differential)

The manual I have specifies the same oil for both front and rear differentials in case anybody is wondering. Rear diffs with LSD require an additive (this is common for clutch pack style differentials).

I don't have AWD so don't have much to contribute there but I figure I'll mention that the transfer case uses different oil (SHELL TF 0870B)

 

[Speeder]

Has anybody with an LSD equipped differential changed their diff fluid? The manual calls for this to be completed at 36k miles for LSD equipped models. I haven't had much luck finding exactly what should be used. I don't particularly care for my dealer so I have not yet asked them.

For the gear oil itself I've found Redline 75W85 GL-5 75W85 GL-5 Gear Oil

Per the manual:
1.47 US QTS (1.4L) required HYPOID GEAR OIL API GL-5 SAE 75W/85 (SK HK SYN LSD GEAR OIL 75W85 or equivalent)*
* Be sure to inject for exclusive use of LSD when replacing Rear Differential Oil (if equipped with Limited Slip Differential)

The manual I have specifies the same oil for both front and rear differentials in case anybody is wondering. Rear diffs with LSD require an additive (this is common for clutch pack style differentials).

I don't have AWD so don't have much to contribute there but I figure I'll mention that the transfer case uses different oil (SHELL TF 0870B)

I was a bit surprised that the manual calls for an oil change at 36K so I looked at the manual for for my 2019 G80 Sport 3.3T. It recommends changing the differential oils at 72K if the car is used under severe driving conditions. Incidentally, the manual for the 2021 GV80 3.5T has the same 72K recommendation.

 

[jetrep]

I was a bit surprised that the manual calls for an oil change at 36K so I looked at the manual for for my 2019 G80 Sport 3.3T. It recommends changing the differential oils at 72K if the car is used under severe driving conditions. Incidentally, the manual for the 2021 GV80 3.5T has the same 72K recommendation.

View attachment 42391

The interval is similar for the g70 for those not equipped with lsd.

 

[jetrep]

Offering an update on this one even though it's not a good one. I stopped by the Genesis dealer on Saturday. The parts guy was not able to look up what oil is to be used for the G70. After I provided the part number for the oil I found online to be the proper spec the guy still couldn't find it in their system to even order. Very strange.

Some research in regards to the Stinger suggests that there have been some issues with the differentials. There's a TSB that specifies Kia/Hyundai/Genesis part number 02100-00121 is the correct product.

 

[jetrep]

I ended up purchasing oil from a Kia dealer. Part number is UM017 CH126. The bottle specifies SAE 75W-85 GL-5 for limited slip differentials. it includes the needed friction modifiers.

 

[ajwklajdskla1]

I ended up purchasing oil from a Kia dealer. Part number is UM017 CH126. The bottle specifies SAE 75W-85 GL-5 for limited slip differentials. it includes the needed friction modifiers.
View attachment 44088

I am also looking to change my LSD gear oil for my 19 3.3 RWD soon. Did you add other "additive" to this gear oil? or does it already have that additive?

 

[JCtx]

Question for those who already changed the differential fluid. Do you need new crush washers? Or do they have O-rings, or other method that doesn't require replacing anything? Just to order them ahead of time when the time comes. My 2023 has no labels or any other marking that I could see at all, and the manual says the 2.0T could have an LSD, but I'm almost sure it's a misprint that was supposed to get removed when the 6MT was discontinued. My confusion is my 2.0T Sport Prestige is the top of the line 2.0T for 2023, so if any 2.0T would have an LSD, it'd be mine. I don't think it does, but there's no way to know for sure, apparently. And yes, it has both drain and fill plugs, so I plan to change the fluid with the 3rd engine oil change around 10K miles (just changed it with 1,724 on the clock). Thx.

 

[jetrep]

I am also looking to change my LSD gear oil for my 19 3.3 RWD soon. Did you add other "additive" to this gear oil? or does it already have that additive?

The "other stuff" one might add to diff fluid would be the friction modifiers. As stated on the bottle this is already included in gear oil I specified. No reason or need to add anything else.

 

[Volfy]

I ended up purchasing oil from a Kia dealer. Part number is UM017 CH126. The bottle specifies SAE 75W-85 GL-5 for limited slip differentials. it includes the needed friction modifiers.

That's correct. It is actually fairly reasonably priced at $13/qt from an online vendor. Mobil 1 75W-90 Synthetic gear lube LS (for Limited Slip) is $16/qt on Amazon. Redline is $20/qt.

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[thatjawncrazy]

Question for those who already changed the differential fluid. Do you need new crush washers? Or do they have O-rings, or other method that doesn't require replacing anything? Just to order them ahead of time when the time comes. My 2023 has no labels or any other marking that I could see at all, and the manual says the 2.0T could have an LSD, but I'm almost sure it's a misprint that was supposed to get removed when the 6MT was discontinued. My confusion is my 2.0T Sport Prestige is the top of the line 2.0T for 2023, so if any 2.0T would have an LSD, it'd be mine. I don't think it does, but there's no way to know for sure, apparently. And yes, it has both drain and fill plugs, so I plan to change the fluid with the 3rd engine oil change around 10K miles (just changed it with 1,724 on the clock). Thx.

Hi, just changed my LSD fluid on my 3.3 and i reused the washer and at 50000 miles it’s not leaking at all. None of the diff oil-change parts are consumable.

For anyone else - i used Valvoline 75W85 with LSD additive and those bottles have the flexible fill neck which worked great. I initially filled too little - and my diff was very loud. So….i filled up to the fill hole and have not had a single noise or leak or issue since.

When i changed it at 36k the oil looked brand new, but I guess better safe than sorry.

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[Volfy]

FWIW, some early Stingers with LSD had issues with noise and chattering. There was this TSB that came out to address that. If you push your G70/Stinger hard at all, it's best to stick to the factory specified replacement schedule. Unlike open diffs that don't normally see any contaminants, LSD with clutch pack do need a bit more attention.

This is the PLUS referred to in the TSB:


So do make sure you get a gear oil that is formulated specifically for LSD.

 

[ajwklajdskla1]

The "other stuff" one might add to diff fluid would be the friction modifiers. As stated on the bottle this is already included in gear oil I specified. No reason or need to add anything else.

Thank you so much for your reply. New to DIY life soo wanted to be sure haha..

 

[ajwklajdskla1]

Hi, just changed my LSD fluid on my 3.3 and i reused the washer and at 50000 miles it’s not leaking at all. None of the diff oil-change parts are consumable.

For anyone else - i used Valvoline 75W85 with LSD additive and those bottles have the flexible fill neck which worked great. I initially filled too little - and my diff was very loud. So….i filled up to the fill hole and have not had a single noise or leak or issue since.

When i changed it at 36k the oil looked brand new, but I guess better safe than sorry.

I also changed it 36k and the oil looked very dirty and alot of stuff were on drain plug.. And i used kia lsd oil. So far no noisy sound or issue after driving 50 miles

 

[Truck Norris]

Had my rear diff fluid changed by the dealer covered under the five year maintenance. Around 60k if I recall on the car (kilometers). No cost.

 

[JCtx]

Isn't it just 3 years or 36-month maintenance? At least in the US it is. Oh, and only one oil change per year, so that statement should have a big asterisk.

 

[Volfy]

Just swapped the open diff on the Stinger for an LSD from a G70 6MT Sport. For the oil, I went with 1qt of Valvoline Synthetic 75w90, mostly because of the flex-fill making filling easy. The balance is topped off with Mobil 1 Synthetic 75w90 LS, which I already have some leftover from a previous job.

Per the factory TSB recommendation, I'm adding a bit more FM (friction modifier) to the mix. Poured in a few Oz. of K&W Limited Slip Diff Additive.

All these were in stock at my local Advance Auto.

 

[canucklehead604]

^ nice work. so the 6MT LSD diff is the same as the 3.3T LSD diff? i believe your Stinger is a 3.3T. that must mean my 6MT diff will be near bulletproof since it's suitable for far more twist than what i'm running...even with the JB4 i had. plenty of other things to wear out, but i guess my diff won't be one of them...i hope.

i'll be pushing my dealer to do a LSD fluid change at this year's 'free' service even though i'm under the mileage threshold. i like to do LSD fluid change by ~30k kms to flush out the filings and clean off the diff magnet.

 

[canucklehead604]

Question for those who already changed the differential fluid. Do you need new crush washers? Or do they have O-rings, or other method that doesn't require replacing anything? Just to order them ahead of time when the time comes. My 2023 has no labels or any other marking that I could see at all, and the manual says the 2.0T could have an LSD, but I'm almost sure it's a misprint that was supposed to get removed when the 6MT was discontinued. My confusion is my 2.0T Sport Prestige is the top of the line 2.0T for 2023, so if any 2.0T would have an LSD, it'd be mine. I don't think it does, but there's no way to know for sure, apparently. And yes, it has both drain and fill plugs, so I plan to change the fluid with the 3rd engine oil change around 10K miles (just changed it with 1,724 on the clock). Thx.

^ the only 2.oT to get a LSD was the 6MT trim based on everything i have seen/heard/read. yours should be an open diff, so your OCI is far longer than with the LSD.

the G70's LSD is very good, by the way. does a better job putting power down than my previous G37S LSD. so if you wanted to do a swap like Volfy it would be worthwhile if you have aspirations to track your ride. if you're AWD don't bother.

 

[Volfy]

From what I can gather: the G70 6MT's LSD has the same final gear ratio as the G70/Stinger 3.3T LSD. However, the LSD P/Ns are different between 2.0T and 3.3T, so I'm not sure if the internals are exactly the same. I'm guessing maybe the number of clutch plates might be different? Dunno.

The LSD I got was indeed from another G70 6MT, so it is exactly the same as what is on my '21 G70 6MT. Because of the lower final gear ratio, my Stinger 2.0T's RPM will be slightly lower in each gear, about 5% so it's not much. Otherwise, it should be a good match, as they are built for the 2.0T powertrain.

Curiously, when I checked KStinger.com, there is apparently an LSD for the Theta II engined Stinger (maybe for different country/region). The oil capacity is different than for 3.3T LSD, so the indication that the internals are different grows stronger. I would've been okay with installing a 3.3T LSD into my Stinger 2.0T, but every one of them on ebay is at least $1200.

I've been very impressed with how well the 6MT G70's LSD worked at AutoX, compared to my Stinger 2.0T with open diff, so for me, this was a must-do mod. Took me a while to hunt down a gently used one at a good price. There are a couple of local Time Trials coming up later this year, so I'm keen to get both cars set up for higher speeds and longer sessions.

 

[Volfy]

so the 6MT LSD diff is the same as the 3.3T LSD diff?

I believe you are correct. I was doing some digging around and found the part number for the LSD carrier core: 53080-4J000. It is the same P/N in all LSDs for G70 and Stinger, both 2.0T and 3.3T.

There are actually 5 different limited slip differentials for the 3.3T: Genuine Hyundai Differential - Hyundai Parts Deal

And one for the 2.0T: Genuine Hyundai Differential - Hyundai Parts Deal

I'm not certain what all the differences are between them, but they all share the same LSD core: 53080-4J000 Genuine Hyundai Differential-Assembly Limited Slip

Hyundai/Genesis shows this P/N to be discontinued, but Kia still lists it as available: 2018-2021 Kia Stinger Differential Carrier 53080 4J000 | Kia Automotive Parts

Anyhow. The point is, you're right that LSD core is designed to take a whole lot more torque than our 2.0T could output, even with JB4. I think we're good to go.


BTW, I felt the LSD kicked in the other day. As I was in the Stinger accelerating out of a right hand sweeper on my usual commute route, the rear axle hit a bump that lay straight across the roadway. The bump was at an angle, such that the inside wheel hit first, followed by the outside wheel. I'm pretty sure the inside wheel lost contact with the tarmac for a split second, tried to spin up, before the LSD sensed it and reacted. I felt the rear end tucked in a bit right after going over the bump. It was an odd feeling but a good one nevertheless, knowing the LSD did exactly what it was designed to do.

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