Diff fluid recommendations - Page 2

fdny · 08-28-2018, 09:54 AM

Quote:

Originally Posted by Camaroguy555

Some people are going to call me crazy but I swapped mine out for Redline 75w140 and all the groaning went away. The other benefit was better clutch engagement (car was way smoother in tight turns). I did track the car regularly which is why I went with 140 weight but even in street driving there was no noticeable downside here in Colorado winters. I am a huge fan of Redline fluids in general, and they do make a 75w90 but I just wanted to share my experience.

You're not crazy at all.....Red Line fluids set the bar, nothing better.

Chef-j · 10-08-2018, 04:01 PM

Bumping old thread.

Planning to do differential fluid change soon. Thinking Redline 75w90 or OEM (but OEM fluid seems to be little confused.)

Marko · 10-08-2018, 05:40 PM

I’m really surprised at the low miles you guys are changing the rear diff fluid. My 18 SS has 3300 miles on it.

Haven’t changed mine yet

KCelsius · 10-22-2018, 07:45 AM

My 1LE is at 1600 miles and I just did the rear diff fluid yesterday and another oil change.

Oil wasn't too dirty but the rear diff fluid definitely looked like a change didn't hurt. The magnetic plug picked up quite a big of gunk and I'm glad it's out the car now. As the fluid was draining you could see some metallic material coming out - just refilled with oem fluid and it was super easy. Better than paying $200 at the dealer when materials cost $30...

Joshinator99 · 10-22-2018, 08:23 AM

Quote:

Originally Posted by Marko

I’m really surprised at the low miles you guys are changing the rear diff fluid. My 18 SS has 3300 miles on it.

Haven’t changed mine yet

Did my SS diff at 1000 miles. Felt like it was good to get any break-in material out of the gear oil.

Jhunsberger · 10-22-2018, 01:33 PM

Just did my diff with OEM fluid, and M6 trans with redline DT4, had 13k on the car. you can certainly tell a difference in the trans, the the rear diff looked like it needed it.

KingLT1 · 10-23-2018, 02:02 PM

Quote:

Originally Posted by Marko

I’m really surprised at the low miles you guys are changing the rear diff fluid. My 18 SS has 3300 miles on it.

Haven’t changed mine yet

I believe it states in the manual to change it at 1500 miles. That is why it is fitted with fill and drain ports unlike older GM rears to make it easier for regular service intervals. These 8.5 rears have less back lash compared to the older stuff.

KingLT1 · 10-23-2018, 02:04 PM

Quote:

Originally Posted by Chef-j

Bumping old thread.

Planning to do differential fluid change soon. Thinking Redline 75w90 or OEM (but OEM fluid seems to be little confused.)

OEM only.

Deakins · 10-25-2018, 12:24 PM

I haven't run OEM fluid in my diff since the first change. 33,000 miles on the clock with 30 or more tack hours with zero groan or issues. Currently running AmsOil 75w90 gear oil with no additive and no groan whatsoever. To each their own.

bnguyen17 · 07-13-2020, 08:47 PM

Quote:

Originally Posted by Camaroguy555

Some people are going to call me crazy but I swapped mine out for Redline 75w140 and all the groaning went away. The other benefit was better clutch engagement (car was way smoother in tight turns). I did track the car regularly which is why I went with 140 weight but even in street driving there was no noticeable downside here in Colorado winters. I am a huge fan of Redline fluids in general, and they do make a 75w90 but I just wanted to share my experience.

did you need limited slip additive?

Clearly_Canadian · 08-26-2020, 11:20 AM

I just did my rearend with Royal Purple Max Gear with Synerlec 75W-90.
Transmission with Royal Purple Synchromax.

getchapull · 09-23-2020, 07:27 PM

Quote:

Originally Posted by Clearly_Canadian

I just did my rearend with Royal Purple Max Gear with Synerlec 75W-90.
Transmission with Royal Purple Synchromax.

Used Royal Purple for my diff and M6. Great stuff!

Wilka_SS · 09-23-2020, 08:59 PM

There is a service bulletin with this concern, the procedure basically tells dealership technicians to flush the diff with new fluid, do figure 8s and keep flushing until the noise is no longer present. I would not use any other fluid than oem even if tracking the car, they have differential coolers for a reason. The noise is caused by the clutches not being broken in or too much material suspended in the fluid. I've done this procedure personally on my own and about 4 other friends cars here locally and have never had to do a second flush. There is an additive in it for the clutches so call me crazy but I dont know anyone with differential problems using oem fluid.

KLG · 09-25-2020, 11:34 AM

Quote:

Originally Posted by Clearly_Canadian

I just did my rearend with Royal Purple Max Gear with Synerlec 75W-90.
Transmission with Royal Purple Synchromax.

Same for me.

10-08-2018, 04:01 PM	#16
Chef-j Drives: 2018 Camaro 1SS Join Date: Jun 2018 Location: DFW Posts: 422	Bumping old thread. Planning to do differential fluid change soon. Thinking Redline 75w90 or OEM (but OEM fluid seems to be little confused.) __________________ 2018 1SS 6MT: SOLD

10-22-2018, 01:33 PM	#20
Jhunsberger Drives: 2017 Camaro 1SS M6 (SOLD) Join Date: Oct 2016 Location: 19518 Posts: 402	Just did my diff with OEM fluid, and M6 trans with redline DT4, had 13k on the car. you can certainly tell a difference in the trans, the the rear diff looked like it needed it. __________________ 2017 1SS M6 Hyper Blue Metallic NPP, MMR 228 Z/28 replica wheels, Front: 20 x 9, Rear 20 x 11 Stock: 416hp/427tq, 12.21 @ 116.80 Modified 02/2019: Whipple SC w/ 3.500 pulley, LT4 fueling, NW 103 TB, Roto-Fab Big Gulp, Kooks 2" jet coated, full Borla ATAK exhaust, DSS axles, Gforce driveshaft. Tuned by EFX Tuning 688hp/632tq Best 1/4 to date: 10.705 @ 131.92

08-26-2020, 11:20 AM	#25
Clearly_Canadian Drives: 2017 2SS Camaro Join Date: Mar 2015 Location: British Columbia Posts: 366	I just did my rearend with Royal Purple Max Gear with Synerlec 75W-90. Transmission with Royal Purple Synchromax. __________________ 2017 Camaro 2SS, K&N Air, Borla S-Type, Cat Delete, 1LE replicas, Hotchkis Swaybars, Eibach Springs. ALL BMR arms, end links, chassis braces and cradle lockout. Hurst shifter.

09-23-2020, 08:59 PM	#27
Wilka_SS Drives: 2016 Nightfall Metallic Grey 2ss Join Date: Oct 2017 Location: New Orleans, LA Posts: 121	There is a service bulletin with this concern, the procedure basically tells dealership technicians to flush the diff with new fluid, do figure 8s and keep flushing until the noise is no longer present. I would not use any other fluid than oem even if tracking the car, they have differential coolers for a reason. The noise is caused by the clutches not being broken in or too much material suspended in the fluid. I've done this procedure personally on my own and about 4 other friends cars here locally and have never had to do a second flush. There is an additive in it for the clutches so call me crazy but I dont know anyone with differential problems using oem fluid. Last edited by Wilka_SS; 09-23-2020 at 11:27 PM.

10-08-2018, 05:40 PM	#17
Marko Drives: Camaro Join Date: May 2016 Location: USA Posts: 139	I’m really surprised at the low miles you guys are changing the rear diff fluid. My 18 SS has 3300 miles on it. Haven’t changed mine yet

10-22-2018, 07:45 AM	#18
KCelsius Drives: 2018 Summit White 1SS 1LE Join Date: Aug 2018 Location: Michigan Posts: 90	My 1LE is at 1600 miles and I just did the rear diff fluid yesterday and another oil change. Oil wasn't too dirty but the rear diff fluid definitely looked like a change didn't hurt. The magnetic plug picked up quite a big of gunk and I'm glad it's out the car now. As the fluid was draining you could see some metallic material coming out - just refilled with oem fluid and it was super easy. Better than paying $200 at the dealer when materials cost $30...

10-25-2018, 12:24 PM	#23
Deakins Drives: 2017 2ss, m6 Join Date: Jan 2017 Location: Iowa Posts: 231	I haven't run OEM fluid in my diff since the first change. 33,000 miles on the clock with 30 or more tack hours with zero groan or issues. Currently running AmsOil 75w90 gear oil with no additive and no groan whatsoever. To each their own.

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