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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > LSD fluid question



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      03-09-2015, 11:26 AM   #1
kisarci
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LSD fluid question

I heard the LSD differentials should have the fluids changed after being "broken in" around 500 miles or so. I was wondering what kind of fluid would be the best to use; price isn't an issue. any ideas?
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      03-09-2015, 11:28 AM   #2
kisarci
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crap i posted in the wrong spot....this is for a 335i but i guess differential fluid is differential fluid....

also how much amount of fluid would i need to get?
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      03-09-2015, 11:35 AM   #3
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Most diff builders recommend or spec a certain type of fluid.

For example, Diffsonline has spec'd Redline 75w90 for street and 75w140 for race

Fill IIRC is under 2 Quarts, but over 1.
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      03-09-2015, 11:44 AM   #4
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ahh ok. I have an Mfactory helical lsd
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      03-09-2015, 11:45 AM   #5
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i guess this thread can be closed. I'm just gonna pm them
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      03-09-2015, 01:14 PM   #6
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correct me if I'm wrong, but you only need an LSD specific fluid for a clutch type differential. I don't think a helical/torsen style needs a specific fluid. The difference is the clutch types need friction modifiers so the clutches don't chatter.
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      03-09-2015, 01:31 PM   #7
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Quote:
Originally Posted by hassmaschine View Post
correct me if I'm wrong, but you only need an LSD specific fluid for a clutch type differential. I don't think a helical/torsen style needs a specific fluid. The difference is the clutch types need friction modifiers so the clutches don't chatter.
It's more to provide lubrication for the actual gear assemblies.

This applies as well for any helical assembly.

Per DiffsOnline:

Quote:
QUAIFE ATB: This differential is QUAIFE’s Automatic Torque Biasing unit. We recommend Redline 75w90 fluid for this application.
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      03-09-2015, 03:06 PM   #8
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75w90 is just regular gear oil.

LSD additive is specifically for clutch type diffs, it has nothing to do with gears.
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