Mobil 424 superceded

[bjm]

Mobil 424 has been superceeded by Mobil 428. Ok for use in the transfer case and steering of the WHs .

[Digian]

I've just come across the same problem, 424 out of stock everywhere and dealers are telling me 428 has replaced it. Looking to do my WJ transfer case.

If you check the product spec sheet though, the viscocity is different so im worried this aint the same oil and reluctant to be the guinea pig especially when these boxes are known to be picky !

https://www.mobil.com/en-nl/commercial-vehicle-lube/pds/gl-xx-mobilfluid-428

https://www.mobil.com/en-uy/commercial-vehicle-lube/pds/gl-xx-mobilfluid-424

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EDIT: Comparing fluid parameters in order of importance according to ChatGPT, im still no expert but it might be okay.

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Mobil 424 to 428 Comparison

1. Density:
   • Mobil 428: 0.866 g/ml
   • Mobil 424: 0.880 kg/l (0.880 g/ml)
   • Implications:
     • Higher Density (Mobil 424): This may provide a slightly better lubricating film due to increased film strength but could also lead to slightly increased weight in the transfer case.
     • Lower Density (Mobil 428) This may result in better flow characteristics, especially at startup. However, the difference in density (0.014 kg/l) is minor and unlikely to cause significant issues.
2. Kinematic Viscosity @ 40°C:
   • Mobil 428: 59 mm²/s
   • Mobil 424: 55 mm²/s
   • Implications:
     • Higher Viscosity (Mobil 428 - Thicker oil, which may provide better lubrication and wear protection under high-load conditions, but could lead to increased resistance and heat generation.
     • Lower Viscosity (Mobil 424): Flows more easily, which may enhance fuel efficiency and cold start performance but could result in less protection under high stress. The difference is relatively small (4 mm²/s) but could matter in extreme conditions.
3. Viscosity Index:
   • Mobil 428: 141
   • Mobil 424: 145
   • Implications:
     • Higher Viscosity Index (Mobil 424): This oil will maintain its viscosity better across a range of temperatures, providing more consistent lubrication, especially under varying operating conditions.
     • Lower Viscosity Index (Mobil 428): More susceptible to viscosity changes with temperature, which could lead to inadequate lubrication if temperatures fluctuate significantly.
4. Flash Point:
   • Mobil 428: 243 °C
   • Mobil 424: 198 °C
   • Implications:
     • Higher Flash Point (Mobil 428): Better thermal stability and safety, can withstand higher temperatures without igniting.
     • Lower Flash Point (Mobil 424): While still safe, the lower flash point means it could be more prone to vaporization or ignition at elevated temperatures, which might be a concern in high-stress environments.
5. Pour Point:
   • Mobil 428: -48 °C
   • Mobil 424: -42 °C
   • Implications:
     • Lower Pour Point (Mobil 428 - Better performance in extremely cold temperatures, ensuring that the oil remains fluid and pumpable. This is critical for cold weather operation and quick starts.
     • Higher Pour Point (Mobil 424): While still low, it may not perform as well in extreme cold conditions, potentially leading to sluggish performance or inadequate lubrication during cold starts.

[Gojeep]

Glad I bought a full case of bottles of the 424!

[5oclock]

Digian...Mate I am no expert either, but after reading through the data sheets you kindly put the link up for, it appears to me that the 428 is being offered as an improved 424. Agree with your point about the transfers being picky, so it does put a bit of a cloud over useing the 428. But looks like we dont have much choice. So anyone who has used the 428 hopefully will post how they got on with the new fluid.....fingers crossed, we might be worried about nothing.

[Jeeper6]

I have 2 x 1 litre bottles of Mobil 424 on the shelf here...bought it for my WH if anybody wants them. I am Northside Brisbane.
I also have a transfer case (no motor) for a WH complete with a new bearing kit open to reasonable offers...
.

[bjm]

The facts are that in all Mobils info the 428 is a direct replacement for the 424.
Mobil 424 will not be available when stock is sold out.When you look at what equipment this hydraulic fluid is and can be used in ,there shouldnt be a problem.!
The major problem for years was oil company catalogues were showing ATF fluid as
ok.it wasnt thats when TCs were failing.Have put the 428 in my 2010 WH and wouldnt expect a problem. 200000 ks with 424 previously no problems.

[Brit30-06]

I've just come across the same problem, 424 out of stock everywhere and dealers are telling me 428 has replaced it. Looking to do my WJ transfer case.

If you check the product spec sheet though, the viscocity is different so im worried this aint the same oil and reluctant to be the guinea pig especially when these boxes are known to be picky !

https://www.mobil.com/en-nl/commercial-vehicle-lube/pds/gl-xx-mobilfluid-428

https://www.mobil.com/en-uy/commercial-vehicle-lube/pds/gl-xx-mobilfluid-424

Now im no expert, but these numbers aint the same folks!

Mobil 428: Density @ 15 C, g/ml, ASTM D4052 = 0.866
Mobil 424: Density @ 15 C, kg/l, ASTM D4052 = 0.880

Mobil 428: Kinematic Viscosity @ 40 C, mm2/s, ASTM D445 - 59
Mobil 424: Kinematic Viscosity @ 40 C, mm2/s, ASTM D445 - 55

Mobil 428: Viscosity Index, ASTM D2270 = 141
Mobil 424: Viscosity Index, ASTM D2270 = 145

Mobil 428: Flash Point, Cleveland Open Cup, °C, ASTM D92 = 243
Mobil 424: Flash Point, Cleveland Open Cup, °C, ASTM D92 = 198

Mobil 428: Pour Point, °C, ASTM D97 = -48
Mobil 424: Pour Point, °C, ASTM D97 = -42

Maybe we have an oil / hydraulic fluid expert in here though...

Hi.
Are Petronas products available to you lads? I am guessing they are.

They offer a product for our NV245 transfer case.It is called Petronas Tutela Powergear4. It lists MS-10216.

It is what the UK Jeep dealers were selling. I have it in my 2008 transfer case and it works just fine. It is after all 'just' a Tractor fluid.

Here is the technical data sheet for comparison.

https://epliportal.pli-petronas.com/ePliAPI/api/document/DownloadDocument?ProductCode=77254&DocumentTypeCode=PDS&CountryCode=GB&LanguageCode=EN

SPECIFICATIONS
SAE 80W, MS 10216, ALLISON C4 Performance, CAT TO-2 Performance,
Volvo WB 101 Performance, ZF TE-ML 03E,05F,17E Performance

TEST DESCRIPTION

TEST DESCRIPTION METHOD UNIT TYPICAL VALUE
ASPECT -- -- B&C
DENSITY 15°C ASTM D 4052 g/cm³ 0.880
VISCOSITY @ 100°C ASTM D 445 cSt 9.3
VISCOSITY @ 40°C ASTM D 445 cSt 55
VISCOSITEITINDEX ASTM D 2270 -- 145
POUR POINT ASTM D 97 °C -42
FLASH POINT Cl. O. C. ASTM D 92 °C 198

I hope this helps.

[Digian]

Hi folks, its been almost a year now since I posted the news about the Mobil 424 transfer fluid being superseded by Mobil 428.

The old 424 should have fully disappeared from all shelves and dealers by now.

Suspect it will be ok but has anyone put reasonable mileage through the 428 fluid that can share their experience ?

[bjm]

Have been using the 428 in the Transfercase now for a year over 25000 ks ,much of that time was towing plus shingle road work.No problems at all
and fluid very clean .