Rear Diff Fluid Change

BanOne · 02-09-2023, 08:45 PM

How often are you guys changing the rear diff fluid? I changed it before the first time I went and then did about 6 events over a year and changed it again and did another 5 events and some autocross before this january. Wondering if I should go longer than a year or keep this pace.

Thanks
Doug

KirillWA · 02-09-2023, 11:55 PM

Same question. High Performance supplement says that changing diff oil is needed after every track day. Seems like an overkill to me.

N Camarolina · 02-10-2023, 01:02 AM

I believe the high performance supplement used to say to change the rear diff fluid every 24 hours. Then I believe it was subsequently changed to every 15 track hours. The 2021 or 2022 HPS then stopped mentioning an interval. But most of us here who track change it every 15 hours, along with the M6 trans fluid at the same interval.

But changing the rear diff fluid after every event would be insane. Now, you may be confusing the part of the HPS that says to change the rear diff fluid after your 1st track event. This is correct to do because it's the first time you are really using rear diff a lot, so there will be more debris in the fluid.

ICTsccaCamaro · 02-10-2023, 01:11 AM

I change manual trans fluid and rear axle fluid before each track season starts, so once a year for both.

That1guy_tim · 02-10-2023, 06:45 AM

Once a year here as well.

RamAir02 · 02-10-2023, 07:06 AM

Another vote for once a year.

I do diff fluid, trans fluid & brake flush (Castrol SRF) before the season. I'll usually do another brake flush halfway through the season. I shoot for an oil change after every event, but once in a while I'll do two events before changing.

My HPDE season is March - October typically, sometimes a November event.

Msquared · 02-10-2023, 08:07 AM

Autocross and track days are both really hard on the diff fluid and clutches, but changing after every event is over the top. I do both activities enough that I just change it every time I change the motor oil and filter. It's not that hard or expensive to do.

Christian1LE · 02-10-2023, 12:07 PM

every 24 hours is what the manual calls for, that's when I do mine.

02-09-2023, 08:45 PM	#1
BanOne Drives: 1977 Pontiac Trans Am Join Date: Oct 2019 Location: Florida Posts: 210	Rear Diff Fluid Change How often are you guys changing the rear diff fluid? I changed it before the first time I went and then did about 6 events over a year and changed it again and did another 5 events and some autocross before this january. Wondering if I should go longer than a year or keep this pace. Thanks Doug

02-09-2023, 11:55 PM	#2
KirillWA Drives: 2022 Camaro 1SS 1LE Join Date: Sep 2022 Location: Seattle, WA Posts: 53	Same question. High Performance supplement says that changing diff oil is needed after every track day. Seems like an overkill to me. __________________ 2022 Camaro 1SS 1LE Rapid Blue 6MT Looking for traction on wet pavement in Seattle.

02-10-2023, 01:11 AM	#4
ICTsccaCamaro ITCRNRS Drives: 2018 ZL1 1LE Join Date: Jun 2012 Location: Wichita KS Posts: 1,575	I change manual trans fluid and rear axle fluid before each track season starts, so once a year for both. __________________ 2018 ZL1 1LE Ordered 6/29/17 Built 11/6/17 Delivered 12/7/17, Summit White, PDR, NAV, https://www.youtube.com/c/tylerpotter SOLD: 2014 Summit White 1LE 2SS/RS, Recaros, NPP, NAV, KONI Yellow's SOLD: 2012 Black 2LT/RS, Fully 1LE swapped, Brembo swap

02-10-2023, 06:45 AM	#5
That1guy_tim Drives: Camaro 1ss Join Date: Nov 2019 Location: Wisconsin Posts: 495	Once a year here as well. __________________ Follow me on IG for build thread! https://www.instagram.com/tracked_1ss/ YouTube: https://www.youtube.com/@Tracked_1ss FortuneAuto Coilovers! https://shop-fortune-auto.com/produc...ries-coilovers

02-10-2023, 07:06 AM	#6
RamAir02 Shadow Gray '19 ZLE M6 Drives: '19 ZL1 1LE M6 Join Date: Apr 2009 Location: NJ Posts: 1,442 View My Garage	Another vote for once a year. I do diff fluid, trans fluid & brake flush (Castrol SRF) before the season. I'll usually do another brake flush halfway through the season. I shoot for an oil change after every event, but once in a while I'll do two events before changing. My HPDE season is March - October typically, sometimes a November event. __________________ 2019 ZL1 1LE \| M6 \| SGM \| PDR \| CF Dash \| Nav \| Wheel Locks PPF \| Paint Correction \| ZL1 Addons Rock Guards \| ZL1 Addons Lift Pads \| ZL1 Addons Feather Lite Tow Hook \| JWM Smoked Sidemarkers \| Wildhammer Smoked Rear Reflectors \| JWM License Plate LEDs \| RotoFab CAI \| ADM IC Reservoir v2 \| BC Forged RZ05 \| SPL Toe Arms \| BW Brake Deflectors \| CMS Roll Bar \| Schroth Profi II ASM Harnesses . Sold: '99 Trans Am (bolt-ons & cam) \| '00 WS6 (bolt-ons, heads, cam, 12 bolt) \| '05 CTS-V (bolt-ons, short throw) \| '10 SS/RS M6 (short throw, CAI, coilovers, LTs, catback, JRE tune) \| '01 WS6 YouTube

02-10-2023, 01:02 AM	#3
N Camarolina Drives: 2021 2SS 1LE Join Date: Aug 2020 Location: Cary, NC Posts: 805	I believe the high performance supplement used to say to change the rear diff fluid every 24 hours. Then I believe it was subsequently changed to every 15 track hours. The 2021 or 2022 HPS then stopped mentioning an interval. But most of us here who track change it every 15 hours, along with the M6 trans fluid at the same interval. But changing the rear diff fluid after every event would be insane. Now, you may be confusing the part of the HPS that says to change the rear diff fluid after your 1st track event. This is correct to do because it's the first time you are really using rear diff a lot, so there will be more debris in the fluid.

02-10-2023, 08:07 AM	#7
Msquared Drives: Chevrolet SS 1LE Join Date: Oct 2019 Location: St. Charles, MO Posts: 1,446	Autocross and track days are both really hard on the diff fluid and clutches, but changing after every event is over the top. I do both activities enough that I just change it every time I change the motor oil and filter. It's not that hard or expensive to do. __________________ Matt Miller 2020 SS 1LE

02-10-2023, 12:07 PM	#8
Christian1LE Drives: 2004 BMW 330CI, 2022 1SS 1LE Join Date: Dec 2021 Location: NC Posts: 746	every 24 hours is what the manual calls for, that's when I do mine.

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