Mobil 1 Gear Oil ok to put in transmission?
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Joined: Jun 2008
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From: Houston, TX
2019 E450 Sedan 4Matic
Mobil 1 Gear Oil ok to put in transmission?
I was just curious if I could use Mobil 1's "Synthetic Gear Lube
LS 75W-90" as an MTL. I know its not specifically written as an "MTL" but I've read threads here saying that people use Royal Purple gear oil as their MTL. This is good for the differential as well right? I don't know when the trans/diff. oil has last been changed (I'm 3rd owner) and it just broke 100k so I thought I might as well do it.
LS 75W-90" as an MTL. I know its not specifically written as an "MTL" but I've read threads here saying that people use Royal Purple gear oil as their MTL. This is good for the differential as well right? I don't know when the trans/diff. oil has last been changed (I'm 3rd owner) and it just broke 100k so I thought I might as well do it.
Thread Starter
Member
Joined: Jun 2008
Posts: 89
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From: Houston, TX
2019 E450 Sedan 4Matic
I would like to replace it since I passed 100k and shifting isnt very smooth.
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
I was just curious if I could use Mobil 1's "Synthetic Gear Lube
LS 75W-90" as an MTL. I know its not specifically written as an "MTL" but I've read threads here saying that people use Royal Purple gear oil as their MTL. This is good for the differential as well right? I don't know when the trans/diff. oil has last been changed (I'm 3rd owner) and it just broke 100k so I thought I might as well do it.
LS 75W-90" as an MTL. I know its not specifically written as an "MTL" but I've read threads here saying that people use Royal Purple gear oil as their MTL. This is good for the differential as well right? I don't know when the trans/diff. oil has last been changed (I'm 3rd owner) and it just broke 100k so I thought I might as well do it.
The approved lubricant from memory is another special with a hard to meet spec. It is designed as filled for life.
That said, I believe the product to be a synthetic, GL4 80W. I do not consider this to be a critical application as long as you don't use a GL5 or higher product. These will cause corrosive wear of the synchro cones
If you are going to change every 50,000 miles then any synthetic, GL4 - 80W will do the trick. The box will soon let you know if it does not like it. Gear change will be notchy.
All that can fail is synchro cones or seals. Stick with GL4 and no exotic synthetics - just a plain PAO & you will be fine.
Do not use ATF Type A Suffix A - that is for older MB manual transmissions & 3 planetary set automatics
The diff needs a GL 5 - The Mobil stuff should be OK for that.
If you have any concerns use the MB approved products
Last edited by Glyn M Ruck; Oct 13, 2008 at 02:18 PM.
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
This is a limited slip product - Have just checked Mobil's product literature & they specifically state that It is not for use in manual transmissions
Last edited by Glyn M Ruck; Oct 13, 2008 at 03:01 PM.
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From: Nuevo México
2005 C230K Sport Sedan, 6 speed manual
Normally, you should not use the same oil in a manual transmission as you do in a differential. This applies to many cars, not just MB.
MB manual transmissions should be using a GL-4 lubricant. The MB part number is A 001 989 26 03 10 for most newer MB's. Redline MTL (Manual Transmission Lubricant) also works well, if you wish to use an aftermarket oil.
MB differentials need a hypoid GL-5 lubricant. The MB part number is A 001 989 17 03 10 for most newer MB's. Redline 75W-90 Hypoid Gear Oil also works well.
Although the lubricants look and seem similar, they are not. They should not be mixed or interchanged.
MB manual transmissions should be using a GL-4 lubricant. The MB part number is A 001 989 26 03 10 for most newer MB's. Redline MTL (Manual Transmission Lubricant) also works well, if you wish to use an aftermarket oil.
MB differentials need a hypoid GL-5 lubricant. The MB part number is A 001 989 17 03 10 for most newer MB's. Redline 75W-90 Hypoid Gear Oil also works well.
Although the lubricants look and seem similar, they are not. They should not be mixed or interchanged.
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Normally, you should not use the same oil in a manual transmission as you do in a differential. This applies to many cars, not just MB.
MB manual transmissions should be using a GL-4 lubricant. The MB part number is A 001 989 26 03 10 for most newer MB's. Redline MTL (Manual Transmission Lubricant) also works well, if you wish to use an aftermarket oil.
MB differentials need a hypoid GL-5 lubricant. The MB part number is A 001 989 17 03 10 for most newer MB's. Redline 75W-90 Hypoid Gear Oil also works well.
Although the lubricants look and seem similar, they are not. They should not be mixed or interchanged.
MB manual transmissions should be using a GL-4 lubricant. The MB part number is A 001 989 26 03 10 for most newer MB's. Redline MTL (Manual Transmission Lubricant) also works well, if you wish to use an aftermarket oil.
MB differentials need a hypoid GL-5 lubricant. The MB part number is A 001 989 17 03 10 for most newer MB's. Redline 75W-90 Hypoid Gear Oil also works well.
Although the lubricants look and seem similar, they are not. They should not be mixed or interchanged.
GL4 & GL5 lubricants are compatible & miscible but not fungible. If you mix them you will end up with a product that does not meet either spec.
Just a word of advice while we are discussing SP gear lubricants. On no account cross contaminate even very small amounts of engine oil with SP gear oils. The reaction of even trace amounts of calcium additive from the engine oil in SP gear oil will cause uncontrolled foaming of the gear oil in service leading to improper lubrication. Do not use the same funnels , containers etc. for both unless you clean them properly in a stoddard solvent or similar.
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Joined: Jun 2008
Posts: 89
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From: Houston, TX
2019 E450 Sedan 4Matic
The difference - in this case, between a GL4 & GL5 lubricant, is that the GL5 has a far higher dose of sulphur phosphorus additive than the GL4. Active sulphur in the presence of heat becomes aggressive to yellow metals (as in synchro cones). There are other ways of meeting GL4, 5 , 6 etc. with, as an example, dispersions of potassium borate in base fluid but we will not confuse the situation by going there.
GL4 & GL5 lubricants are compatible & miscible but not fungible. If you mix them you will end up with a product that does not meet either spec.
Just a word of advice while we are discussing SP gear lubricants. On no account cross contaminate even very small amounts of engine oil with SP gear oils. The reaction of even trace amounts of calcium additive from the engine oil in SP gear oil will cause uncontrolled foaming of the gear oil in service leading to improper lubrication. Do not use the same funnels , containers etc. for both unless you clean them properly in a stoddard solvent or similar.
GL4 & GL5 lubricants are compatible & miscible but not fungible. If you mix them you will end up with a product that does not meet either spec.
Just a word of advice while we are discussing SP gear lubricants. On no account cross contaminate even very small amounts of engine oil with SP gear oils. The reaction of even trace amounts of calcium additive from the engine oil in SP gear oil will cause uncontrolled foaming of the gear oil in service leading to improper lubrication. Do not use the same funnels , containers etc. for both unless you clean them properly in a stoddard solvent or similar.
Ah thanks for the information.
