M6 tranny and diff fluid

zx9rmal · 06-30-2020, 10:49 AM

I'll be having the fluids changed soon. I know there are better than OEM manual tranny fluids out there, but what about the diff? I've read that the OEM diff fluid is pretty good.

Recommendations on both? Thanks.

SteveV · 06-30-2020, 10:51 AM

There is one poster on here that had problems with the Royal Purple Synchormax in his ZL1 1LE, but I put it in my regular ZL1 and love it. Shifts so much smoother than before.

As far as diff fluid, since I am still within my warranty, I put the factory recommended AC Delco fluid in. Seems to work just fine.

zx9rmal · 06-30-2020, 10:53 AM

Quote:

Originally Posted by SteveV

There is one poster on here that had problems with the Royal Purple Synchormax in his ZL1 1LE, but I put it in my regular ZL1 and love it. Shifts so much smoother than before.

As far as diff fluid, since I am still within my warranty, I put the factory recommended AC Delco fluid in. Seems to work just fine.

Thanks. Interesting about the RP fluid. I've only heard good things.

HypeBlueZL1 · 06-30-2020, 12:21 PM

Another vote here for stock diff fluid but RP in the manual trans. The RP improved the way shifts feel tremendously.

minn19 · 06-30-2020, 01:05 PM

Stock diff fluid and Redline D4 ATF for the M6. As others, I’m very happy with it over the stock fluid. It really smooths out the 2nd gear notchiness.

k20attack · 06-30-2020, 01:17 PM

How many miles are you guys changing the M6 tranny fluid at?

SteveV · 06-30-2020, 01:23 PM

I did the diff the first time at 1500 miles. Then I did the diff for the 2nd time AND the tranny fluid at 16,000.

k20attack · 06-30-2020, 01:30 PM

Quote:

Originally Posted by SteveV

I did the diff the first time at 1500 miles. Then I did the diff for the 2nd time AND the tranny fluid at 16,000.

OK. Thanks. I already did the diff at 1500. Only at 7000 miles so not close yet on the transmission.

Anyone have a link to the RP trans fluid?

Thanks

puppykat33 · 06-30-2020, 01:43 PM

TREMEC makes their own fluid they recommend for their trannys now. i dont know about it but it may be worth a try.
https://www.tremec-store.com/collect...smission-fluid

SteveV · 06-30-2020, 01:55 PM

Quote:

Originally Posted by k20attack

OK. Thanks. I already did the diff at 1500. Only at 7000 miles so not close yet on the transmission.

Anyone have a link to the RP trans fluid?

Thanks

I bought mine from Amazon...

https://www.amazon.com/Royal-Purple-...5-4be35d7258cc

minn19 · 06-30-2020, 02:02 PM

Quote:

Originally Posted by k20attack

How many miles are you guys changing the M6 tranny fluid at?

About 7k miles. I was lazy and had the dealer do it when they were doing my track alignment.

getchapull · 06-30-2020, 05:01 PM

I switched over to Royal Purple Synchormax and the shifts are great. They are even better when I run through the gears prior to driving. Like a pre lubing.

I also put RP diff fluid in the differential and it hasn't grenaded contrary to what I was told...

breakskeet · 07-01-2020, 05:03 AM

Using RP in the trans and diff. 5500 track miles and no problems. I have changed the tranny fluid once and diff fluid twice during those miles and there is hardly any metal sludge on the metallic drain plugs on the diff and the tranny fluid looked like new. RP fluids have worked excellent so far in my car.

06-30-2020, 10:49 AM	#1
zx9rmal Drives: '20 ZL1 M6 Join Date: Apr 2017 Location: FT. Lauderdale, FL Posts: 717	M6 tranny and diff fluid I'll be having the fluids changed soon. I know there are better than OEM manual tranny fluids out there, but what about the diff? I've read that the OEM diff fluid is pretty good. Recommendations on both? Thanks. __________________ Mal Ft. Lauderdale, FL '20 Camaro ZL1 M6 '22 Kawasaki ZX-14R

06-30-2020, 10:51 AM	#2
SteveV Drives: 2018 ZL1 Camaro 6M Red Hot Join Date: Aug 2013 Location: Cary, NC Posts: 1,137 View My Garage	There is one poster on here that had problems with the Royal Purple Synchormax in his ZL1 1LE, but I put it in my regular ZL1 and love it. Shifts so much smoother than before. As far as diff fluid, since I am still within my warranty, I put the factory recommended AC Delco fluid in. Seems to work just fine. __________________ People are a lot like slinky's: not very helpful most of the time, but they bring a smile to your face when pushed down the stairs...

06-30-2020, 01:17 PM	#6
k20attack Drives: 2018 Camaro ZL1 M6 Join Date: Jul 2017 Location: Boston Posts: 135	How many miles are you guys changing the M6 tranny fluid at? __________________ 1100-9/17/2017 3000-9/18/2017 Received-12/1/2017

06-30-2020, 01:23 PM	#7
SteveV Drives: 2018 ZL1 Camaro 6M Red Hot Join Date: Aug 2013 Location: Cary, NC Posts: 1,137 View My Garage	I did the diff the first time at 1500 miles. Then I did the diff for the 2nd time AND the tranny fluid at 16,000. __________________ People are a lot like slinky's: not very helpful most of the time, but they bring a smile to your face when pushed down the stairs...

06-30-2020, 01:43 PM	#9
puppykat33 Drives: Black 2019 ZL1 M6, Join Date: Sep 2019 Location: Georgia Posts: 322	TREMEC makes their own fluid they recommend for their trannys now. i dont know about it but it may be worth a try. https://www.tremec-store.com/collect...smission-fluid __________________ 2019 Black ZL1, M6, CF Hood and Dash, Nav System, ZL1 Addons rock guards and lift points, Michelin Pilot Sport 4S, DD Smoked Marker Lights, Ceramic window tint, Gtechniq 9yr ceramic coating. JL Audio stealth box 12W6, Dyanamat trunk, Dead pedal cover, Soler TB/TC, Green Filter, Carbon-fiber Borla S-Type

06-30-2020, 12:21 PM	#4
HypeBlueZL1 Drives: Chevrolet Camaro ZL1 Join Date: Sep 2019 Location: Planet Earth Posts: 73	Another vote here for stock diff fluid but RP in the manual trans. The RP improved the way shifts feel tremendously.

06-30-2020, 01:05 PM	#5
minn19 Drives: 22 ZL1, 20 Taco, 20 Cayenne S Join Date: Oct 2019 Location: MN Posts: 624	Stock diff fluid and Redline D4 ATF for the M6. As others, I’m very happy with it over the stock fluid. It really smooths out the 2nd gear notchiness.

06-30-2020, 05:01 PM	#12
getchapull TEXIT Drives: 2019 ZL1 M6 Join Date: Aug 2018 Location: Republic of Texas Posts: 160	I switched over to Royal Purple Synchormax and the shifts are great. They are even better when I run through the gears prior to driving. Like a pre lubing. I also put RP diff fluid in the differential and it hasn't grenaded contrary to what I was told...

07-01-2020, 05:03 AM	#13
breakskeet Kevin Drives: 2018 Callaway Camaro ZL1 1LE Join Date: Apr 2018 Location: Rattlesnake, FL Posts: 321	Using RP in the trans and diff. 5500 track miles and no problems. I have changed the tranny fluid once and diff fluid twice during those miles and there is hardly any metal sludge on the metallic drain plugs on the diff and the tranny fluid looked like new. RP fluids have worked excellent so far in my car.

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