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#1
11-06-2009, 05:35 AM
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Trans and diff oil recommendation!
Hey i have a 1998 m3 and need some help finding out what tranny oil would be best for a car that get's ran hard all the time! no mods to the gears or anything so they are 100% stock along with the diff! no sure on what oil to use in the diff, its lsd and not sure if i should use one with an additive or not! and what weights i should use in both for a car that gets abused every weekend! any suggestions would be much help!!!! car is turbo so i would like something that would hold up and do a good job!
thanks David Last edited by Sykes1330; 11-06-2009 at 05:36 AM.. Reason: spelling 
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#2
11-06-2009, 10:57 AM
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Personally, I use Royal Purple Synchromax (sp?) for the tranny and Amsoil 75w140 for the diff. Been running them for a year with no problems but I might try Redline fluid in the transmission next.
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Mods:
TCK s/a coilovers, GC camber plates, Rogue RTABs, slotted rotors, PFC Z pads, ss lines, Dinan CAI, Dinan Stage 3 software, UUC System U, 3.46 gears, UUC ssk w/bushings, ZHP knob, UUC tranny mounts, Stewart w/p, aluminum tstat housing, new OEM: lip spoiler, fender liners, rad hoses, clear corners, roundels
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#3
11-06-2009, 11:26 AM
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You'll probably get as many opinions as there are people.
 I have used Royal Purple Synchromax for my transmission and Royal Purple 75W-90 gear oil for my diff. The racing folks often use 75W-140 or 85W-140. My only comment is that the Synchromax was great in the warmer months, but now in the colder months, it definitely feels thicker than the OE fluid when the car is not warmed up yet. Once it's warmed up, it feels great, though. Of course, you're in Hawaii... I don't think that'll be an issue. 
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1998 M3 Sedan
2007 X3 3.0si 2006 MINI Cooper S 
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#4
11-07-2009, 01:25 AM
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Quote:
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 1998 328is 5sp Cosmos schwarz Metalic CDV delete urethane LCAB OEM Sachs replacement clutch tranny mounts and shifter bushings Sparco strut brace ASC-T delete blacked out corners, tails and side markers and smoked fogs Apexcone Ellipsoid w/6000K HID angel eyes/smoked Lamin-X Prosport gauges 35% tint all around Last edited by jmo69; 11-07-2009 at 01:34 AM..
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#5
11-07-2009, 01:33 AM
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Redline products have always served me well.
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#6
11-07-2009, 06:01 AM
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Any more ideas for a good oil for tranny and diff, for a track car, or one that will be treated like a track car lol and thanks for everyones answers so far I'm just really trying to find a gold one that will hold up well and keep my gears in the best shape!
but I will let you guys know what one I choose!! And what weight also! Thanks and feel free to say what you run in your own bmws!!! Thanks again David
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