Which Differential Oil?

TipsZ · 12-15-2009, 04:50 PM

Which Diff oil should I use?

Redline 75w90NS Gear oil quarts and cases (w/o friction modifier)
or
Redline 75w90 Gear oil quarts and cases (w/friction modifier)

I am not sure by what is meant by the "friction modifier".

davidyan · 12-15-2009, 10:13 PM

Use the one with with friction modifiers (ie, non-NS) version for your rear differential. See descriptions from Redline's website below.

75W90NS GEAR OIL

This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.

75W90 GEAR OIL 1 QUART

Our most popular gear oil, this is the preferred product in nearly all car and light truck differentials, both conventional and limited-slip. 75W90 is preferred for most racing applications. It contains friction modifier which is recommended for limited-slip units. 75W90 Gear Oil can be used in many transmissions and transaxles; however, other Red Line lubricants have better frictional properties for rapid synchronization. Exceeds API GL-5.

TipsZ · 12-16-2009, 09:19 AM

Would using the 75W90NS (without the friction modifier) harm the Differential at all? Are there any drawbacks to using the non-friction modifier oil?

Modshack · 12-16-2009, 09:37 AM

Quote:

Originally Posted by TipsZ

Would using the 75W90NS (without the friction modifier) harm the Differential at all? Are there any drawbacks to using the non-friction modifier oil?

I believe the friction modifiers are used in clutch style limited slip systems. Corvettes continue to have a problem with sticking plates, hence their need for Friction modifiers in the gear oil. The Z has a sealed Viscous system so the fluid type has no impact there.

TipsZ · 12-16-2009, 10:40 AM

Thanks for the info everyone!

semtex · 12-16-2009, 06:25 PM

I have Redline 75W90 in mine, and it works fine.

wishihadnav · 12-17-2009, 01:35 PM

motul

TipsZ · 12-27-2009, 09:50 PM

One would think that we should use the NS designation since it allows for "transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting". Even Modshack stated that it "should not" make a difference as to which one to utilize.

I think I am going to order the NS designated oil and try it out and let you guys know how it goes.

75W90NS GEAR OIL

This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.

Modshack · 12-27-2009, 10:11 PM

Quote:

Originally Posted by TipsZ

One would think that we should use the NS designation since it allows for "transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting". Even Modshack stated that it "should not" make a difference as to which one to utilize.

.

Remember, No Synchronizers or Clutch type LSD's to worry about with the Z. Spec's say use a GL-5 fluid...

I used Eneos: Nippon Oil | ENEOS MT Fluid

TipsZ · 12-27-2009, 10:16 PM

So in your experience the Nippon Oil | ENEOS MT Fluid is superior to the Redline 75W90NS?

Modshack · 12-27-2009, 10:21 PM

Quote:

Originally Posted by TipsZ

So in your experience the Nippon Oil | ENEOS MT Fluid is superior to the Redline 75W90NS?

Who knows? It is a high spec GL-5 ubricant sold by the largest oil Co. in Japan though. Several of my friends and the local Rice shop have had good experience with it..

FuszNissan · 12-27-2009, 11:11 PM

I prefer Redline, but Eneos will due the trick

davidyan · 12-28-2009, 03:13 AM

Quote:

Originally Posted by TipsZ

One would think that we should use the NS designation since it allows for "transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting". Even Modshack stated that it "should not" make a difference as to which one to utilize.

I think I am going to order the NS designated oil and try it out and let you guys know how it goes.

75W90NS GEAR OIL

This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.

It might be correct that the 370Z differential doesn't need the friction modifiers in the regular 75-90, but it can't hurt it. I don't think you'll benefit from using the NS version over the regular GL5 75-90 (w/friction modifier)unless you were to use it in a Manual transmission. The NS is designed for either non-LSD's or MT's requiring GL5. Any reason you need the NS version? Just curious because the benefits you cited would only be for when it is placed in the MT. (but our MT requires GL4, the MT-90 version).

TipsZ · 12-29-2009, 04:55 PM

I have a Manual Transmission which is why I brought that issue forward. Someone else sited the differences between the GL5 and GL4 specs in another thread, and I thought it was determined that GL5 was a higher speced product, which led me to believe you could use GL5 in place of GL4. Is that a correct assumption?

Modshack · 12-29-2009, 06:20 PM

Quote:

Originally Posted by TipsZ

I have a Manual Transmission which is why I brought that issue forward. Someone else sited the differences between the GL5 and GL4 specs in another thread, and I thought it was determined that GL5 was a higher speced product, which led me to believe you could use GL5 in place of GL4. Is that a correct assumption?

Are you talking Trans or rear? If you read the other thread you'll see I used it in both despite the critics. Eneos is marketed for it and has been formulated to deal with the sulphur issue. Not all GL-5 spec oil has apparently. Car is running and shifting great. If you're not sure, then MT-90 in the trans, and a GL-5 spec in the dif.

12-15-2009, 04:50 PM	#1 (permalink)
TipsZ Track Member Join Date: Mar 2009 Location: Lithia, FL Age: 51 Posts: 552 Drives: 09 Nissan 370z CS M6 Rep Power: 186	Which Differential Oil? Which Diff oil should I use? Redline 75w90NS Gear oil quarts and cases (w/o friction modifier) or Redline 75w90 Gear oil quarts and cases (w/friction modifier) I am not sure by what is meant by the "friction modifier". __________________ Dynojet 285 HP/245 TQ (pre CBE)// Agency Power CBE // GTM Test Pipes // JWT Pop Chargers // B&M Short Shifter // Eibach Springs // Powder-coated Akebono's // Powder-coated Strut Bar // Black Chromed 19" Rays // // Redline Designs Graphics TipsZ journal

12-16-2009, 09:19 AM	#3 (permalink)
TipsZ Track Member Join Date: Mar 2009 Location: Lithia, FL Age: 51 Posts: 552 Drives: 09 Nissan 370z CS M6 Rep Power: 186	Would using the 75W90NS (without the friction modifier) harm the Differential at all? Are there any drawbacks to using the non-friction modifier oil? __________________ Dynojet 285 HP/245 TQ (pre CBE)// Agency Power CBE // GTM Test Pipes // JWT Pop Chargers // B&M Short Shifter // Eibach Springs // Powder-coated Akebono's // Powder-coated Strut Bar // Black Chromed 19" Rays // // Redline Designs Graphics TipsZ journal

12-16-2009, 10:40 AM	#5 (permalink)
TipsZ Track Member Join Date: Mar 2009 Location: Lithia, FL Age: 51 Posts: 552 Drives: 09 Nissan 370z CS M6 Rep Power: 186	Thanks for the info everyone! __________________ Dynojet 285 HP/245 TQ (pre CBE)// Agency Power CBE // GTM Test Pipes // JWT Pop Chargers // B&M Short Shifter // Eibach Springs // Powder-coated Akebono's // Powder-coated Strut Bar // Black Chromed 19" Rays // // Redline Designs Graphics TipsZ journal

12-16-2009, 06:25 PM	#6 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 32	I have Redline 75W90 in mine, and it works fine. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

12-27-2009, 09:50 PM	#8 (permalink)
TipsZ Track Member Join Date: Mar 2009 Location: Lithia, FL Age: 51 Posts: 552 Drives: 09 Nissan 370z CS M6 Rep Power: 186	One would think that we should use the NS designation since it allows for "transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting". Even Modshack stated that it "should not" make a difference as to which one to utilize. I think I am going to order the NS designated oil and try it out and let you guys know how it goes. 75W90NS GEAR OIL This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin. __________________ Dynojet 285 HP/245 TQ (pre CBE)// Agency Power CBE // GTM Test Pipes // JWT Pop Chargers // B&M Short Shifter // Eibach Springs // Powder-coated Akebono's // Powder-coated Strut Bar // Black Chromed 19" Rays // // Redline Designs Graphics TipsZ journal

12-15-2009, 10:13 PM	#2 (permalink)
davidyan Base Member Join Date: Jun 2009 Location: CA Posts: 244 Drives: PG 370Z Sport 6MT Rep Power: 16	Use the one with with friction modifiers (ie, non-NS) version for your rear differential. See descriptions from Redline's website below. 75W90NS GEAR OIL This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin. 75W90 GEAR OIL 1 QUART Our most popular gear oil, this is the preferred product in nearly all car and light truck differentials, both conventional and limited-slip. 75W90 is preferred for most racing applications. It contains friction modifier which is recommended for limited-slip units. 75W90 Gear Oil can be used in many transmissions and transaxles; however, other Red Line lubricants have better frictional properties for rapid synchronization. Exceeds API GL-5.

12-17-2009, 01:35 PM	#7 (permalink)
wishihadnav A True Z Fanatic Join Date: Nov 2009 Location: 90090 Posts: 1,851 Drives: Force Fed Nismo Rep Power: 184	motul

12-27-2009, 10:16 PM	#10 (permalink)
TipsZ Track Member Join Date: Mar 2009 Location: Lithia, FL Age: 51 Posts: 552 Drives: 09 Nissan 370z CS M6 Rep Power: 186	So in your experience the Nippon Oil \| ENEOS MT Fluid is superior to the Redline 75W90NS? Abdulaziz_Z34 likes this. __________________ Dynojet 285 HP/245 TQ (pre CBE)// Agency Power CBE // GTM Test Pipes // JWT Pop Chargers // B&M Short Shifter // Eibach Springs // Powder-coated Akebono's // Powder-coated Strut Bar // Black Chromed 19" Rays // // Redline Designs Graphics TipsZ journal

12-27-2009, 11:11 PM	#12 (permalink)
FuszNissan A True Z Fanatic Join Date: May 2009 Location: St. Louis Posts: 14,275 Drives: Pure Sex Rep Power: 542	I prefer Redline, but Eneos will due the trick __________________ Mods: Too Many to list! LouFuszNissan ZDAYZ 2012

12-29-2009, 04:55 PM	#14 (permalink)
TipsZ Track Member Join Date: Mar 2009 Location: Lithia, FL Age: 51 Posts: 552 Drives: 09 Nissan 370z CS M6 Rep Power: 186	I have a Manual Transmission which is why I brought that issue forward. Someone else sited the differences between the GL5 and GL4 specs in another thread, and I thought it was determined that GL5 was a higher speced product, which led me to believe you could use GL5 in place of GL4. Is that a correct assumption? __________________ Dynojet 285 HP/245 TQ (pre CBE)// Agency Power CBE // GTM Test Pipes // JWT Pop Chargers // B&M Short Shifter // Eibach Springs // Powder-coated Akebono's // Powder-coated Strut Bar // Black Chromed 19" Rays // // Redline Designs Graphics TipsZ journal

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
DIY: Rear Differential Oil Change	spearfish25	DIY Section (Do-It-Yourself)	195	06-08-2020 03:06 PM
differential whine	Pharmacist	Nissan 370Z General Discussions	9	03-21-2011 08:42 AM
viscous slip differential	zellsexy	Engine & Drivetrain	45	12-26-2009 08:14 PM
Differential clunking...	6SPD_FTW	Engine & Drivetrain	9	05-23-2009 09:44 AM
LS Differential Fluid Changeout	SoCal 370Z	Engine & Drivetrain	1	03-15-2009 04:18 PM