Rear differential oil alternatives? - BMW M5 Forum and M6 Forums
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post #1 of 10 Old 11th July 2016, 08:07 PM Thread Starter
dr_dirtg
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Rear differential oil alternatives?

Hey guys, have you tried to use any of the other and much cheaper oils for your differential?

Motul, Redline, Royal Purple?

What about LiqiMoly?
Does this product have FM booster:
It says it has BMW Hinterachsgetriebeöl whatever that may be?
LIQUI MOLY - Motor Oils, Additives, Car Care - Products - Fully Synthetic Hypoid Gear Oil (GL5) LS SAE 75W-140

https://pim.liqui-moly.de/pidoc/P000...40-10.0-us.pdf
The spec sheet says it fullfills BMW requirements, but I would like to hear the expert's opinions on this forum.

Thanks!
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post #2 of 10 Old 11th July 2016, 08:50 PM
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I use Redline ShockProof Lightweight in my custom Performance Gearing 3.91 diff.

Red Line Synthetic Oil - ShockProof® Gear Oils - Lightweight ShockProof®

I made with switch in 2014 after my old Dinan 3.91 blew up on me:
https://www.m5board.com/vbulletin/e60...my-3-91-a.html

~Woody

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post #3 of 10 Old 11th July 2016, 09:36 PM
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I like this oil since it has a Group 4 base will try next.

aFe Power Pro Guard D2 is a full synthetic limited slip gear oil in 75-140 grade. This competition proven formulation utilizes a group IV synthetic base

recommended by Turner
https://www.turnermotorsport.com/p-2...tial-gear-oil/

I bought Red Line as recommended by ECS this time around.
Will change often after track events based on observed degradation
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post #4 of 10 Old 11th July 2016, 09:51 PM
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Per Redline: "Fully-synthetic formulas created from polyol ester base stocks, offer excellent lubrication under extreme conditions"

Red Line Synthetic Oil - Gear Oil for Differentials - 75W140 GL-5 Gear Oil

This is a quality product that may exceed the BMW oil depending on base stock it uses.

As evidenced by:

"Polyol esters can extend the high temperature operating range of a lubricant by as much as 50 – 100°C due to their superior stability and low volatility. They are also renowned for their film strength and increased lubricity which is useful in reducing energy consumption in many applications. The only downside of polyol esters compared to diesters is their higher price tag, generally 20 – 70+% higher on a wholesale basis."

"In general, polyol esters represent the highest performance level available for high temperature applications at a reasonable price. Although they cost more than many other types of synthetics, the benefits often combine to make this chemistry the most cost effective in severe environment applications. The primary benefits include extended life, higher temperature operation, reduced maintenance and downtime, lower energy consumption, reduced smoke and disposal, and biodegradability."

Esters In Synthetic Lubricants - Bob is the Oil Guy
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post #5 of 10 Old 11th July 2016, 09:55 PM
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Woody

Per your Sig:

" FastAttack Tune, w/Kung Fu grip!"

Where can I buy me some Kung Fu Grip?

LOL
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post #6 of 10 Old 11th July 2016, 10:17 PM
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post #7 of 10 Old 11th July 2016, 10:43 PM
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I used the Royal Purple 75-140 with the FM additive, and still had some chattering driving through the sharp turns in the parking garage. Added 3-4 oz of some Ford friction modifier I had and it's all good.
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post #8 of 10 Old 11th July 2016, 11:27 PM
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Quote:
Originally Posted by dr_dirtg View Post
Hey guys, have you tried to use any of the other and much cheaper oils for your differential?

Motul, Redline, Royal Purple?

What about LiqiMoly?
Does this product have FM booster:
It says it has BMW Hinterachsgetriebeöl whatever that may be?
LIQUI MOLY - Motor Oils, Additives, Car Care - Products - Fully Synthetic Hypoid Gear Oil (GL5) LS SAE 75W-140

https://pim.liqui-moly.de/pidoc/P000...40-10.0-us.pdf
The spec sheet says it fullfills BMW requirements, but I would like to hear the expert's opinions on this forum.

Thanks!
I used Liqui Moly for 500 miles but the chatter never went away. Replaced with OEM, no more chatter. LM does not have FM booster or at least the one that I used.
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post #9 of 10 Old 11th July 2016, 11:31 PM Thread Starter
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wow thanks for all the responses, lots of good info in short amount of time.

So the liquimoly brand is available locally, however they want $40 for a 1L bottle.
I also called the dealer here, which i try to avoid at all costs, and they only have huge jugs. But he said I would have to bring in a small container and they would fill it up for $35 per liter.
This so far sounds like the best option for me ( i dont race/track, i just punch it every other now and then)
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post #10 of 10 Old 11th July 2016, 11:46 PM
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Mercedes sells the Castrol SAF-XJ 75W140 in 500ml bottles

mercedes part number: 001989520310

edit:

pelican parts seems to have a pretty good deal on it, at $30/Liter before shipping

Last edited by JohnAnthony; 11th July 2016 at 11:48 PM.
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