OS Giken LSD Differential Oil options

fl335i · 08-24-2012, 07:56 AM

I've been running the 80-250 OS Giken brand diff oil since I got the diff in my car. I have about 900 miles on it and am due for a change. I've been reading some people run 75/140 Syn GL5 oil. I don't track my car, other than the occasional drag race. 99.5% of the time I'm driving spirited around town. Not to mention I am running the Finned aluminum VAC Cover which helps keep the oil cool and increased the capacity I believe. I really would like to run a medium thickness oil; 75-140. Question is what kind should I be running. Do I need the slip additives or just pure 75-140? Anyone have experiences trying different oils in their OSG?

JamesM3M5 · 08-24-2012, 10:37 AM

I don't have any experience with the OS diff, but Motul 75W140 Gear Competition or BMW Castrol XJ from the dealer would be my choices. The Motul is about half the price of the XJ. No need for additional limited slip additive unless your diff groans in tight turns.

Randomaccess335 · 08-24-2012, 10:40 AM

Off topic question

Did it make a difference/better in launching at the track?

I'm getting high 1.8 to 2.0 60ft times on 19" street tires w/auto...... I think that's pretty good

People are saying this is the best mod other than a tune...... Do u agree?
Ty,
R

fl335i · 08-24-2012, 11:34 AM

Havne't tracked my car yet. But man it's nice driving a 2 wheel drive RWD car again.

335i should of come with a LSD. I love the VAC diff cover. Can't believe I was on the fence about it.... so glad I did it while I was there. I even sent a plug to Gold Plug and had them make me a magnetic drain plug for the VAC cover. Can't run a diff w/out a magnet... hell I run magnets in everything. Best thing you can do.

I called OSG today. They pretty much said the thinner the fluid the more noise and the quicker it will lock. Too much fricion modifier and you won't get proper lockup. So it's a crap shoot. I'm going to try some Mobil 1 75-140, which has some friction modifier in it. Can't buy it w/out it. I have 2 cans of the OSG stuff still on the shelf, but I really want to see how it sounds and works with medium grade oil. 75/90 is out of the question for a performance diff like this and power. So it's either a 75/140 or the OSG lube. So why not try it out and report back.

cleex024 · 08-24-2012, 11:40 AM

actually i was wondering about this too...i changed my oil already once and the stuff is like honey...its sooo thick lol.

cstavaru · 08-24-2012, 12:02 PM

Quote:

Originally Posted by fl335i

I've been running the 80-250 OS Giken brand diff oil since I got the diff in my car. I have about 900 miles on it and am due for a change. I've been reading some people run 75/140 Syn GL5 oil. I don't track my car, other than the occasional drag race. 99.5% of the time I'm driving spirited around town. Not to mention I am running the Finned aluminum VAC Cover which helps keep the oil cool and increased the capacity I believe. I really would like to run a medium thickness oil; 75-140. Question is what kind should I be running. Do I need the slip additives or just pure 75-140? Anyone have experiences trying different oils in their OSG?

There is a Castrol Syntrax Limited Slip 75-140 which I am running, which (probably) has every additive a clutch-style LSD needs. But Drexler recommended me this and I am not switching it.

However, I would highly recommend sticking to the manufacturer-recommended oil (OS Giken). Your diff was designed and tested with that oil and those additives, you can't beat that. I read of many cases when using a different oil caused noises, thumps and other problems in LSD operation.

fl335i · 08-24-2012, 12:29 PM

^ that is true.... Maybe I'll just call it a day and run the OSG oil I have and not spend $20/Liter on Mobil 1 stuff just for an experiment.

fl335i · 08-26-2012, 07:28 PM

Changed it yesterday. Drove the car around for a few miles then drained it for about an hour. Had 860 miles on it since the diff went in. Fluid coming out was pretty nasty. Filled it back up with OSG fluid. Drove it around, smooth and quieter. Should be good for 30k.

BlueBimmer · 08-26-2012, 08:29 PM

I'm no expert but a while back (in my old E34) - everywhere on the forums people were swearing by redline transmission and diff fluid. It's not cheap either.

You might want to look into it.

08-24-2012, 07:56 AM	#1
fl335i Captain 146 Rep 942 Posts Drives: 335i Join Date: Oct 2010 Location: FL iTrader: (2)	OS Giken LSD Differential Oil options I've been running the 80-250 OS Giken brand diff oil since I got the diff in my car. I have about 900 miles on it and am due for a change. I've been reading some people run 75/140 Syn GL5 oil. I don't track my car, other than the occasional drag race. 99.5% of the time I'm driving spirited around town. Not to mention I am running the Finned aluminum VAC Cover which helps keep the oil cool and increased the capacity I believe. I really would like to run a medium thickness oil; 75-140. Question is what kind should I be running. Do I need the slip additives or just pure 75-140? Anyone have experiences trying different oils in their OSG? __________________ '07 335i Sedan, base pkg, 6spd Manual, Procede 3 V5 w/NLS, Macht Schnell Downpipes, 18" Staggered 313's w/Conti DWS's, OS Giken TCD LSD, VAC Street Diff Cover, Dinan Oil Cooler, Dinan Intercooler, Akebono Euro Pads, CDV Removed, Black BMW Grilles, Interior & Exterior white LED lighting, LUX Angel Eyes, Debadged, Blend V1 mount, Llumar ATR Tint.
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08-24-2012, 10:37 AM	#2
JamesM3M5 Some dude 92 Rep 1,780 Posts Drives: E92 335i Join Date: Sep 2011 Location: Northern VA iTrader: (0)	I don't have any experience with the OS diff, but Motul 75W140 Gear Competition or BMW Castrol XJ from the dealer would be my choices. The Motul is about half the price of the XJ. No need for additional limited slip additive unless your diff groans in tight turns. __________________ RRT E92 335i/6MT with stuff and things
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08-24-2012, 10:40 AM	#3
Randomaccess335 Captain 69 Rep 868 Posts Drives: 07' 335I Join Date: Mar 2011 Location: boynton beach, Fl iTrader: (11)	Off topic question Did it make a difference/better in launching at the track? I'm getting high 1.8 to 2.0 60ft times on 19" street tires w/auto...... I think that's pretty good People are saying this is the best mod other than a tune...... Do u agree? Ty, R __________________ JB4 G5 ISO , AR DP's, DO Meth kit Trunk Mount, ETS 5" Intercooler, M6 Rims, ER Charge Pipe, Fordged DV's, MMp relocated inlets, Ebay 4" chrome Tips, Lux Angel Eyes ********11.910 @ 117.091.851 60'*********
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08-24-2012, 11:34 AM	#4
fl335i Captain 146 Rep 942 Posts Drives: 335i Join Date: Oct 2010 Location: FL iTrader: (2)	Havne't tracked my car yet. But man it's nice driving a 2 wheel drive RWD car again. 335i should of come with a LSD. I love the VAC diff cover. Can't believe I was on the fence about it.... so glad I did it while I was there. I even sent a plug to Gold Plug and had them make me a magnetic drain plug for the VAC cover. Can't run a diff w/out a magnet... hell I run magnets in everything. Best thing you can do. I called OSG today. They pretty much said the thinner the fluid the more noise and the quicker it will lock. Too much fricion modifier and you won't get proper lockup. So it's a crap shoot. I'm going to try some Mobil 1 75-140, which has some friction modifier in it. Can't buy it w/out it. I have 2 cans of the OSG stuff still on the shelf, but I really want to see how it sounds and works with medium grade oil. 75/90 is out of the question for a performance diff like this and power. So it's either a 75/140 or the OSG lube. So why not try it out and report back. __________________ '07 335i Sedan, base pkg, 6spd Manual, Procede 3 V5 w/NLS, Macht Schnell Downpipes, 18" Staggered 313's w/Conti DWS's, OS Giken TCD LSD, VAC Street Diff Cover, Dinan Oil Cooler, Dinan Intercooler, Akebono Euro Pads, CDV Removed, Black BMW Grilles, Interior & Exterior white LED lighting, LUX Angel Eyes, Debadged, Blend V1 mount, Llumar ATR Tint. Last edited by fl335i; 08-24-2012 at 11:39 AM..
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08-24-2012, 11:40 AM	#5
cleex024 Lieutenant Colonel 104 Rep 1,529 Posts Drives: 2008 BMW 335i Coupe Join Date: Mar 2011 Location: Woodbridge iTrader: (2)	actually i was wondering about this too...i changed my oil already once and the stuff is like honey...its sooo thick lol. __________________ Space Gray l 6MT l OSG LSD w/ VAC Race Diff Cover l Cobb e30 l Morr vs8.2 l UUC SSK w/ DSSR l VSRF Catless Dps l RPI Intercooler l CDV Removed l HID AE 8000k l ETS Catback l AST 5200 w/ Vorshlag Camber Plates l ER Dual Oil Coolers l Rear Camber and Toe Arms l K&N Drop In l Solid Tranny/Diff/Subframe Bushings l Bridgestone RE-11
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08-24-2012, 12:29 PM	#7
fl335i Captain 146 Rep 942 Posts Drives: 335i Join Date: Oct 2010 Location: FL iTrader: (2)	^ that is true.... Maybe I'll just call it a day and run the OSG oil I have and not spend $20/Liter on Mobil 1 stuff just for an experiment. __________________ '07 335i Sedan, base pkg, 6spd Manual, Procede 3 V5 w/NLS, Macht Schnell Downpipes, 18" Staggered 313's w/Conti DWS's, OS Giken TCD LSD, VAC Street Diff Cover, Dinan Oil Cooler, Dinan Intercooler, Akebono Euro Pads, CDV Removed, Black BMW Grilles, Interior & Exterior white LED lighting, LUX Angel Eyes, Debadged, Blend V1 mount, Llumar ATR Tint.
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08-26-2012, 07:28 PM	#8
fl335i Captain 146 Rep 942 Posts Drives: 335i Join Date: Oct 2010 Location: FL iTrader: (2)	Changed it yesterday. Drove the car around for a few miles then drained it for about an hour. Had 860 miles on it since the diff went in. Fluid coming out was pretty nasty. Filled it back up with OSG fluid. Drove it around, smooth and quieter. Should be good for 30k. __________________ '07 335i Sedan, base pkg, 6spd Manual, Procede 3 V5 w/NLS, Macht Schnell Downpipes, 18" Staggered 313's w/Conti DWS's, OS Giken TCD LSD, VAC Street Diff Cover, Dinan Oil Cooler, Dinan Intercooler, Akebono Euro Pads, CDV Removed, Black BMW Grilles, Interior & Exterior white LED lighting, LUX Angel Eyes, Debadged, Blend V1 mount, Llumar ATR Tint.
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08-26-2012, 08:29 PM	#9
BlueBimmer Enthusiast 45 Rep 278 Posts Drives: 2009 335i Convertible Join Date: Apr 2012 Location: PA iTrader: (5)	I'm no expert but a while back (in my old E34) - everywhere on the forums people were swearing by redline transmission and diff fluid. It's not cheap either. You might want to look into it.
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