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Originally Posted by 123Britt
OK - so I boiled down the question to RL vs OEM.
IMO RL 75w-90 for diff is really good as well as other RL MT or ATF fluids.
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I think the OEM fluids are more lifetime or 100k fluids ~ meaning OEM fluids need to be changed around 50k while the RL fluids would need to be replaced every 30k.
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At least this is my schedule -- although I have used OEM MT fluid but RL in the DIFF.
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RL 5W-30 oil with OCI of 5K in an N54 for me as well -- RL has been great.
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RL 75/90 NS for the diff unless you have a clutch type LSD
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2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
Quaife lsd, ETS fmic, GIAC s/w, Dinan intake/exhaust/oc, Koni/M3 susp, Apex Arc 8, Mich PSS