[swastikviji]

Hi Friends,
Until today i don't know that how ignorant our local mechanic, i just done my first service after rebuilding my white army spec mm -550, i saw something is missing, i asked my mechanic weather u replaced diff oil he said yes sir, and for my shock its 90 grade oil, i asked him again Yar this jeep is eqiped with LSD and companywala has specially fitted a small embosed metal piece mentioning we have to use separate oil for this, he checked and confirmed Sir Something Shell written their more then that i can't read, please Experts Advice me which oil is recommended and Availability please.

[ex670c]

Originally Posted by swastikviji

Hi Friends,
Until today i don't know that how ignorant our local mechanic, i just done my first service after rebuilding my white army spec mm -550, i saw something is missing, i asked my mechanic weather u replaced diff oil he said yes sir, and for my shock its 90 grade oil, i asked him again Yar this jeep is eqiped with LSD and companywala has specially fitted a small embosed metal piece mentioning we have to use separate oil for this, he checked and confirmed Sir Something Shell written their more then that i can't read, please Experts Advice me which oil is recommended and Availability please.

Hi Viji,

I don't know the companywala spec, But I have been using GL5 85w140 since 2006.

Any Brand, but the specifications are GL5 85W140.

Also try this in you Gearbox and T-Case, even front Axle.

Tipper Guard Max 85W-140 is a Gear Oil of Ashok Leyland

Regards,

Arka

[fazalaliadil]

Originally Posted by swastikviji

Sir Something Shell written their more then that i can't read.

swastikviji,
As per the manufacturers recommendation for LSD, the embossed plate reads: SHELL-SPIRAX HD 90.

Regards,

[swastikviji]

Originally Posted by fazalaliadil

swastikviji,
As per the manufacturers recommendation for LSD, the embossed plate reads: SHELL-SPIRAX HD 90.
Attachment 465954
Regards,

Fazal sir/Arka thank you, i got Ashokleyland oil, Shell is not Available off the Shelf.

Fazal sir off the topic,, where u get this brand new label?

[fazalaliadil]

Originally Posted by swastikviji

Fazal sir/Arka thank you, i got Ashokleyland oil, Shell is not Available off the Shelf.

Fazal sir off the topic,, where u get this brand new label?

Good Morning Viji,
This is not a brand new one, as advised by Arka, I had picked up a pair of army MM550 front and rear diffs. for my CJ 340...this plate luckily survived but was all painted and re painted over. I removed it all and got it zinc plated.

Arka,
What do you have to advice reg. the viscosity of the oil that you use against the manufacturers recommendation/ specs?
Regards,

[ex670c]

Originally Posted by fazalaliadil

Arka,
What do you have to advice reg. the viscosity of the oil that you use against the manufacturers recommendation/ specs?
Regards,

Hi Fazal,

I don't know much about gear oils, but I prefer using a High Quality Gear Oil which works for all the Gears in my vehicle, Front & Rear Differentials, Gear Box and Transfer Case & Steering Box.

A GL5 Oil is an Extreme Pressure Oil.

And since it is Multi-Grade its Low temperature Viscosity is that of a 85W Oil, and High Temperature Viscosity of a 140W Oil.

Also it has various additives, which prevent corrosion.

Gear oils [SubsTech]

Regards,

Arka

[Jaggu]

Originally Posted by ex670c

And since it is Multi-Grade its Low temperature Viscosity is that of a 85W Oil, and High Temperature Viscosity of a 140W Oil.

Even i was wondering the same, isn't it better to use multi instead of single grade?

Viji good that you found the oil, i need a bucket of same brew. Gonna do a minor overhaul and service of DwArF and right time to shift to leyland oil

[ex670c]

Hi Fazal,

What is the Standard Differential Gear Oil used in JEEPs?

It is a 140W Gear Oil, for Tropical (Hot Weather & Humidity) Use.

In Colder Climates (Europe/North America) 80W90 or even a 90W is suitable.

But Why is Shell SPRIAX 90 recommended for the LSD?

In a LSD 2 components generate Heat.

i) The Crown & Pinion Assy (Spider/Differential Pinion Gears)
ii) The Wet Clutch Plates of the LSD.

If we use a 140W Oil the Clutch Plates will not get adequately lubricated, initially as the Oil is too thick to penetrate between the Clutch Plates, and the Clutch Plates wear out.

But a 90W oil is more suitable to lubricate the wet clutch plates of the LSD, as it is thinner and once it heats up the differential starts to sing, especially in Hotter Parts of the country.

But a 85W140 works a bit differently, initially it lubricates the wet clutch plates, and as things get hotter the oil gets thicker, giving lubricating the Crown & Pinion Gears.

It is a smarter Lubricant, but the biggest advantage is not that is is suitable for LSD or Differential, but even Gear Boxes, where a 140W is too thick to lubricate, initially when the gear box is warming/heating up.

Since it is a better lubricant, and has multiple use in a single vehicle, it cuts down inventory.

Experts please correct or make the necessary additions.

Regards,

Arka

[fazalaliadil]

Thanks Arka,

That is very well explained, I get the point and understand the advantages of multi grade in the differentials.

Now my question is, when this particular LSD was standard for the army 550's in India, so was this plate specifying the oil grade, fitted (in India) on differentials with the imported LSD in it.

In spite of the hot climate here, the factory fitted plate recommending Shell Spirax 90, same as in colder countries?

Was this oil recommendation on plate an oversight, or is it the right grade to be used?

Sir Behram or Spike can perhaps enlighten us and also let us know what the army has been using.

Regards,

[ex670c]

Originally Posted by fazalaliadil

Thanks Arka,

That is very well explained, I get the point and understand the advantages of multi grade in the differentials.

Now my question is, when this particular LSD was standard for the army 550's in India, so was this plate specifying the oil grade, fitted (in India) on differentials with the imported LSD in it.

In spite of the hot climate here, the factory fitted plate recommending Shell Spirax 90, same as in colder countries?

Was this oil recommendation on plate an oversight, or is it the right grade to be used?

Sir Behram or Spike can perhaps enlighten us and also let us know what the army has been using.

Regards,

Hi Fazal,

My guess that when 1970s design, TRAC-LOK was introduced 1996-2000 MM550XD Vehicles, Shell SPIRAX A GL5 90W, was the easiest available GL5 oil.

Regards,

Arka

[swastikviji]

Replaced Oil with Shell Spirax, the best part as explained by Arka same brew is Suitable for LSD differential, trancefercase,and main Gear Box. not drove the vehicle after oil change, i will post after driving it in next OTR, if i feel any major changes in performance.

[trammway]

Gurus,

I have got a Friction Additive along with the Auburn GEAR LSD unit, The recommendation as mentioned in the friction additive's lable:


"All Auburn Gear Performance Limited-Slip Differential designs have been extensively teated with high quality non-synthetic 80W90 hypoid gear oil treated with Auburn Gear friction additive part number, 504102.

3 oz. of additive will treat 1 quart of oil.
6 oz. of additive will treat 2 quarts of oil.
9 oz. of additive will treat 3 quarts of oil.

To avoid differential clutch chatter(noise) and for optimum performance, use the oil described and this additive in the prescribed amount. Use of other additives and oil types may cause differential clutch chatter."

I think as Arka states "GL5 85W140" should be a replacement, as it has already got the required Additives.

[Sutripta]

Originally Posted by ex670c

....
But a 85W140 works a bit differently, initially it lubricates the wet clutch plates, and as things get hotter the oil gets thicker, giving lubricating the Crown & Pinion Gears.
....
Regards,

Arka

Hi,
I think a multigrade does not thin out as much as a single grade, rather than becoming thicker with increasing temp.

Maybe someone can compare the lubrication needs of a) Slushbox, b) LSD (clutch type) and c) Motorcycle gearbox. In all three cases, the lubrcant has to lubricate, while maintaining the friction characteristics of the clutches/ brakes.

Regards
Sutripta

[ex670c]

Originally Posted by ex670c

But a 85W140 works a bit differently, initially it lubricates the wet clutch plates, and as things get hotter the oil gets thicker, giving lubricating the Crown & Pinion Gears.

Originally Posted by Sutripta

Hi,
I think a multigrade does not thin out as much as a single grade, rather than becoming thicker with increasing temp.

Hi Sutripta,

Thanks for the correction.

Regards,

Arka

[Bronco Buster]

Dear jeep gurus, how many litres of lsd oil will be required for the front/rear differntial, transfer case and gear box? And after I drain the old oil, do I need to clean up using some kind of solution before I put the new oil? Sorry too many questions, and thanks in advance.

Regards,

Bronco Buster