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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 03-12-2006, 05:41 PM   #1 (permalink)
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friction modifiers for salisbury limited slip

guys (zibby?):

what exactly do these friction modifiers do? my lsd runs three shims in the clutch packs. it makes a little grinding noises with redline 70/90 gear lube, which contains 5% of the modifiers. i knwo that these diffs are loud (i had one in a truck), and this one is pretty quiet overall.

is it reasonable to get it up to 7-8% (they sell the modifier solo)? if so, what exactly is the predicted effect?used:

peter
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Old 03-12-2006, 09:12 PM   #2 (permalink)
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Hi Peter !

Hmm... long story short:Friction modifiers alter an oil’s coefficient of friction. Typical friction modifiers include organic fatty acids and amides, high molecular weight organic phosphorus and phosphoric acid esters.Perhaps I am conservative regarding automotive oil products, but personally I would not use anything else in BMW cars differentials, than their original stuff(castrol SAF-XJ for limited slip and castrol SAF-XO for regular one)Those lubricant were developped by Castrol in cooperation with BMW for these cars and have special pakage added to its formulation.The reason these differs are loud or whining , because lots of people put in other stuff like Amsoil, Redline, etc...
Peter, remember never ever put 75w90 gear oil to limited slip differ,it calls for 75w140(as original fill) your rear end gonna be much quieter and you will get better performance from it.
Best regards:
Z.

BTW do not put any shit (modifiers) into differ , you will only make it worse !
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Old 03-13-2006, 10:04 AM   #3 (permalink)
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