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      06-11-2014, 01:27 PM   #1
omglukewtf
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Royal Purple Max Gear Spec for Diff Oil

I've searched but can't find an answer to this. I'm going to replace my diff oil with Royal Purple Max Gear but don't know if I should use 75W-140 or 75W-90

Any suggestions?
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      06-11-2014, 08:05 PM   #2
Caddyshk
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Don't. e46 crowd reported problems...
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SS Race Cans, RE X Pipe, DKF Sec 1, Fabspeed Headers, OE STB, AS Shifter, Dave Z CDV, GC Coil Overs, Stoptech lines, Hawk DTC Pads, RE Clutch Stop, RE Transmission Mounts, Vibra-Technics Engine Mounts, Poly FCAB & RTAB, LeatherZ M Shift Boot, Tekarbon Rear Spoiler, CF Grills, Advan RS DGM
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      06-13-2014, 12:27 AM   #3
StickMon
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Royal Purple in the trans, OEM with FM Boo$ter in the diff.
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Warning: May contain traces of nuts.
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      06-13-2014, 10:39 AM   #4
omglukewtf
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Thanks for the info, from the sounds of it people are having mixed results with it so I'll just avoid it and go OEM.
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      06-13-2014, 08:01 PM   #5
Caddyshk
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I recently purchased Motul to replace the OE. I recall seeing somewhere it is Castrol or vise versa...
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      06-14-2014, 01:02 AM   #6
Shipkiller
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Garage List
FM Booster is only needed if you hear grinding when doing very tight, low speed turns. Most cars (Z4M's) do not need it. Some do. There is a SIB on this.

I take a CLEAN one gal. jug (I sourced from my local Granger store) to my dealer and he puts two pints of SAF-XJ in the jug.

Castrol SAF-XJ PN # 83 22 1 467 993 (expensive)
Castrol SAF-XJ + FM PN # 83 22 2 282 583 (really expensive)
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      06-16-2014, 03:43 PM   #7
DanFromTucson
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I have redline, and I do experience the grinding. Has anyone tried adding the friction modifier to redline fluid?
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