Differential oil and additive for LSD

[HawaiiPD]

I swapped out the open rear differential in my new 2018 Stinger 3.3 TT to a LSD I ordered on E Bay.
It is marked with this ratio 3.538 open on the original diff.
The LSD was new in box and marked 3.538 LSD. Took months to find that ratio, most were the 3.7 from the 2.0 coupes.
The Honolulu dealer did the labor for $360 and the parts to my door was $2250. I had the dealer use Royal Purple with the additive. Dealer said the new diff is a Kia part, so the work is under warrantee. 10 years, 100,000 miles.
I have now driven the Stinger for 1 year with no problems.

 

[Volfy]

Yes, all LSDs for G70/Stinger have the 3.538:1 ratio. This is true even for the LSD that came with our 6MT 2.0T G70's.

All G70/Stinger 2.0T 8AT models have the 3.73:1 ratio. This means my Stinger 2.0T's engine RPM is about 5% lower with the new LSD. Not really enough to matter realistically.

I saw the brand new LSD on ebay (530004J126 OEM CARRIER ASSY-DIFFERENTIAL For Hyundai G70, Kia Stinger / DHL | eBay), but I'm too cheap to drop $2k on one. So I hunted for quite a while for a used one. I finally found one from a 6MT G70 with 15k miles on it for $675 and jumped on it. It even came with the cush drive ring & bolts attached. The same ebay seller has another one for $699 right now, if anybody is interested. This one has 35k miles on it, but still a good deal IMO.

$360 for the R&R is pretty good deal. I did mine DIY and it was a solid 1-1/2 day's work. But... I needed to swap out the rear brake splash shields with larger ones that fit the Brembo calipers I installed more than a year ago. That required removal of the 1/2 shafts anyway, so I saved some work doing two jobs at the same time. Not to mention swapping Eibach lowering springs at the same time.

 

[slimjim2525]

Reviving this thread, for a heads up. At 36,500 miles I changed my rear diff fluid in my 2021 G70 prestige with the LSD rear differential. I tried to get the OEM fluid but 3 places said they don't have it. I ended up putting Valvoline 75W90 with LSD additive in it. Immediately I noticed chattering coming from the rear end when cornering and the fluid was cold. This went away when the fluid got hot. I ended up putting CRC Trans X LSD oil additive. After adding this the chattering disappeared immediately. Not sure why the Valvoline with LSD friction modifiers wasn't good enough to prevent the chattering. On the next change will definitely being going to something else. Maybe Royal Purple, Redline, or Amsoil.

 

[jetrep]

Reviving this thread, for a heads up. At 36,500 miles I changed my rear diff fluid in my 2021 G70 prestige with the LSD rear differential. I tried to get the OEM fluid but 3 places said they don't have it. I ended up putting Valvoline 75W90 with LSD additive in it. Immediately I noticed chattering coming from the rear end when cornering and the fluid was cold. This went away when the fluid got hot. I ended up putting CRC Trans X LSD oil additive. After adding this the chattering disappeared immediately. Not sure why the Valvoline with LSD friction modifiers wasn't good enough to prevent the chattering. On the next change will definitely being going to something else. Maybe Royal Purple, Redline, or Amsoil.

Thanks for your update. I considered the Valvoline stuff before ultimately going with KIA fluid.

Did you try sourcing the OEM fluid at a KIA dealer? I had no trouble doing so. I saw the TSB on LSD issues in Stingers so I didn't want to take any chances and went with the factory stuff. Aftermarket wasn't any cheaper so there wasn't much incentive to go that direction. Using the KIA stuff also meant not having to deviate from the weight specified in the manual.

I replaced my diff fluid a couple thousand miles ago...no issues with the LSD.

 

[JCtx]

Do you guys also recommend the factory fluid for the open diff on a '23 2.0 Sport Prestige? Car is almost new, but for future reference . Thx.

 

[Volfy]

Reviving this thread, for a heads up. At 36,500 miles I changed my rear diff fluid in my 2021 G70 prestige with the LSD rear differential. I tried to get the OEM fluid but 3 places said they don't have it. I ended up putting Valvoline 75W90 with LSD additive in it. Immediately I noticed chattering coming from the rear end when cornering and the fluid was cold. This went away when the fluid got hot. I ended up putting CRC Trans X LSD oil additive. After adding this the chattering disappeared immediately. Not sure why the Valvoline with LSD friction modifiers wasn't good enough to prevent the chattering. On the next change will definitely being going to something else. Maybe Royal Purple, Redline, or Amsoil.

I added CRC Trans-X to Valvoline 75w90 from the get-go (see post#16 above). Runs both road and track flawlessly. I'll probably just keep using the same mix, as they are readily available from Advance Auto store 5min from my house.

Like just about every car mfr, Hyundai and Kia don't make their own oils. They just rebrand whichever supplier they source their oils from. They could change suppliers any time unannounced. That is likely why they had to issue that TSB and change their fill recommendation. New supplier's LS fluid didn't work the same as their old supplier.

At least with the major aftermarket brands, they do formulate their own, so I'm more sure of getting the same stuff every time.

 

[Truck Norris]

Can anyone provide the TSB for the Genesis G70? I saw the TSB for the Stinger but would like the G70 TSB if anyone has it, or a link, etc. Everything you're saying @Volfy makes sense. I had my rear diff changed a year ago or so by the dealer and it was... different afterwards. Noisy now to the point I'm getting it looked at this Friday with an appointment for tires.

 

[Volfy]

Not sure if there is a TSB specific to the G70, but this one for the G80 is basically the same test procedure. Pretty sure G80 has the same Brembo brakes.

16-01-043 Genesis Technical Service Bulletin

16-01-043 Genesis Technical Service Bulletin

www.tsbsearch.com

 

[canucklehead604]

while at the dealership yesterday i asked about a diff fluid change for my LSD rear end. i was told it'd be "over $200" to which i laughed and said no thanks. so then i went to the parts counter to buy the oil to do it myself. they said the fluid was $104.95 per bottle, which aligned with what the service guy said. amazing.

i later called a local Kia dealer and was told their fluid was ~$50 a bottle. i asked what type it was, if it was for LSD diff's, and the guy said this was the only fluid they used in all their vehicles. after some back and forth i was not convinced the guy knew anything nor was the fluid what i wanted. he gave me the part # and it seems like a standard fluid for open diffs...as i suspected.

so, while i have more local dealers to call for the OEM fluid, i'm looking to get part #'s for what people have purchased lately. perhaps the 02100-00121 part # has changed? the Genesis/Hyundai part # was different when i asked at the parts counter. the Kia # was totally different than the UM017-CH126. he looked that up and found nothing. if i can't get the fluid at a reasonable price locally i'll buy online.

if that fails, has anyone used Redline or Amsoil fluids in their G70 LSD? Redline has a 75W85 GL-5 lightweight gear oil, but their 75W90 is more widely used and that's what i used in my E39 540i/6 (open diff). Amsoil has their 75W90 and i have used that before in my past G35/G37's.

 

[HawaiiPD]

I think the G70 is based on the Kia Stinger platform which I have. I have successfully had the Kia dealership install a new in box Kia LSD ( a complete unit) and I provided them with Royal purple LSD oil with the additives. The rear end takes about 1 1/2 quarts, so I gave them 2 quarts to install.

I have driven the car about 1 1/2 years since the change and there have been NO problems. No strange noises or stuttering from the new diff. So Royal purple works for me @ $12.00 a quart.

I have had the Stinger from new. The Kia dealership said that the diff is a new Kia part and the swap is under warrantee 10 years/100,000 miles. So all is good.

______________________________

Help support this site so it can continue supporting you!

 

[Volfy]

I stopped buying boutique brand oils years ago. The local auto parts stores have plenty of good quality stock that have worked well in my vehicles over the decades. Of course, some due diligence is prudent on specific applications like our LSD diffs.

 

[canucklehead604]

...Of course, some due diligence is prudent on specific applications like our LSD diffs.

^ agreed, which is why i'd prefer to go with OE Hyundai/Kia fluid with matching 75W85 specs but none of the local dealers seem to stock it or, for some of them, know what an LSD is.

limited options for 75w85 GL-5 up here, but i know Redline has it. parts stores mainly have 75W90 which i may end up going with as well, more options with that weight and it doesn't get super cold here in the winter so i'm not worried about a slightly heavier gear oil.

 

[canucklehead604]

so i finally reached a local dealer who could find a part # for the LSD gear oil. 00232-19075 is what i was given. this is a different # than what others have posted - maybe it supersedes a previous #...dunno. they wanted $105 per bottle. found it online for $26 so i'll likely go that route if shipping is reasonable. otherwise i'll have to find a matching spec alternate like Redline.

seems to be the correct fluid, 75W85, GL-5 for LSD.

00232-19075 Genuine Hyundai 75W-85 Gear Oil, Gl-5, LSD

Genuine 00232-19075 75W-85 Gear Oil, Gl-5, LSD fits Hyundai models. HyundaiPartsDeal offers 0023219075 for $26.10.

www.hyundaipartsdeal.com

 

[Volfy]

limited options for 75w85 GL-5 up here, but i know Redline has it. parts stores mainly have 75W90 which i may end up going with as well, more options with that weight and it doesn't get super cold here in the winter so i'm not worried about a slightly heavier gear oil.

Practically speaking, there is little to no difference. The base Viscosity Index for both is 75w. The 2nd number just means at higher temps, one thins like an oil 85VI, the other thins like an oil with 90VI. Similar to engine oils, this just means 75w90 probably has a bit more viscosity modifiers (long chain polymers). For those of us who do occasionally drive our cars harder (which results in higher diff temp), this is actually good to have, especially for us living in warmer areas.

Just like motor oils, those polymers do get sheared/worn, so the higher the number spread, the more polymers % content, the less base oil % content, the more frequent the oil should be changed. Again, the difference is negligible, and I typically change out the oil more frequently than mfr spec anyway.

Besides, the difference could simply be how the mfr of the gear oil rate and spec the oil. This is particularly true between conventional and synthetic oils, which can exhibit rather different viscosity profiles.

In short, I don't get too hung up on 85 vs. 90. The best oil is a fresh oil. Regardless of which you choose, brand new oil will always outperform old, worn, and debris-laden oil.

 

[yostrovsky]

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.

​

After I replaced gear oil with Mobil 1 75W-90 Synthetic gear lube LS differential started making noise on sharp turns on low speed.
After 5K miles I decided to change oil again.
But this time with OEM oil part 00232-19075 75W 85 Gear Oil Gl 5 Lsd 00232-19075 | OEM Parts Online
I will post the result.
Sorry for my grammar, English isn't my native.

 

[JCtx]

I ended up putting Valvoline 75W90 with LSD additive in it. Immediately I noticed chattering coming from the rear end when cornering and the fluid was cold.

This fluid should be fine for an open diff '23 Sport Prestige 2.0T, right? Or does it also need to be 75/85? But no LSD additive needed, correct? Thx.

 

[yostrovsky]

Here what I've got from the dealer.

 

[yostrovsky]

OK.
I replaced gear oil.
Vibration become worth.

After 150 miles vibration and grinding noise gone.
I would strongly recommend to use oil specified in the manual.

 

[yostrovsky]

This fluid should be fine for an open diff '23 Sport Prestige 2.0T, right? Or does it also need to be 75/85? But no LSD additive needed, correct? Thx.

If you have LSD use ONLY 75/85.
No additive needed.

 

[JCtx]

Mine doesn't have LSD. Or at least it doesn't say on the window sticker, so doubt it has it, since it's a 4 banger. So which fluid for the non-LSD? Thx.