11-18-2022, 08:14 PM | #1 |
Drives: 2015 zl1 m6 Join Date: Jan 2020
Location: Alaska
Posts: 702
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Amsoil said :go back to gm rear diff fluid -zl1
So I thought I would report what I found out - when I finished my build last summer - I was wondering why the low speed chatter in the rear was coming when I was idling through the neighborhood ..
Was on the forum today and stumbled onto a rear diff fluid thread - some posted they added additive to amsoil severe gear 75/90 and eliminated the chatter and wine (which I don’t think I had whine going on at all) other than the low speed chatter everything else worked fine . Although I’ve ran the track and dyno and a lot of spirted driving this summer .. So I called amsoil tech line today - told them my car make and model - asked them how much of their friction modifier additive do I need to add - they replied that I needed to go back to gm rear diff as they don’t have any diff fluid that was on par with gm #88862624 for the zl1 .. so today I drained it ,in my short summer the diff fluid was already pretty grey .. no metal chunks or anything and maybe 1/8 inch of grey goop on the drain plug .. put in gm rear diff but sad to say I won’t be able to drive it till spring .. wanted to put the right stuff in. Now so that in spring I don’t forget as I might get to excited and forget .. Lesson learned I’m gonna stick with gm rear diff from now on .. hopefully this gets rid of the chatter at low speed and I didn’t hurt my rear diff ..which all my buddy that I’ve talked to said it be fine .. just my ocd driving me nuts lol Oh btw sever gear amsoil says that it already has the additive in it ,so that why I never added any
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791whp 699 ft lbs torque on E30 - ported sc /heads by boost mode racing - PAT G cam /Tune
PB:10.7 @133.9 Last edited by Risingson05; 11-18-2022 at 10:14 PM. |
11-19-2022, 08:28 AM | #2 |
I run Amsoil in my ZL1 and zero problems, change every 2 years and it looks brand new?
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11-19-2022, 08:38 AM | #3 | |
Drives: 2015 zl1 m6 Join Date: Jan 2020
Location: Alaska
Posts: 702
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Quote:
That oil that I drained has only been in my diff for 4 months
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791whp 699 ft lbs torque on E30 - ported sc /heads by boost mode racing - PAT G cam /Tune
PB:10.7 @133.9 |
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11-19-2022, 08:46 AM | #4 |
Drives: 2015 zl1 m6 Join Date: Jan 2020
Location: Alaska
Posts: 702
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Here’s what their website says when I look it up for our cars . Reiterates what I was told by one of their techs
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791whp 699 ft lbs torque on E30 - ported sc /heads by boost mode racing - PAT G cam /Tune
PB:10.7 @133.9 |
11-19-2022, 12:00 PM | #5 |
Camaro #4
Drives: 2017-Hyper Blue Metallic-2LTmanual Join Date: Dec 2015
Location: NE Ohio (Akron)
Posts: 1,210
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I've run the Amsoil Severe Gear in my 2013 for over 100,000 miles (changed @ 75,000 and again at 150,000) and I haven't had any issues either. Mine is a V6, manual trans, with the posi rear end.
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Don M
Supercharged LGX + 6 speed manual = FUN!! |
11-19-2022, 12:43 PM | #6 |
Drives: 2015 zl1 m6 Join Date: Jan 2020
Location: Alaska
Posts: 702
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Yes sir , it’s only zl1 specific for their diff oil
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791whp 699 ft lbs torque on E30 - ported sc /heads by boost mode racing - PAT G cam /Tune
PB:10.7 @133.9 |
11-19-2022, 07:00 PM | #7 |
Drives: 2013 ZL1 Join Date: Nov 2018
Location: Mobile Al
Posts: 301
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Put some limited slip additive in it, it will be quieter on turns for sure.
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2013 ZL1 M6, 2.4 pulley and a few bolt ons. 590 wheel and 11.70@122 on a hard tire.
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11-20-2022, 07:45 AM | #8 |
SEVERE GEAR® 75W-90
Product code : SVGPK-EA 4.9 star rating Read 601 reviews Advanced protection against wear Controls thermal runaway Protects against rust and corrosion Helps reduce operating temperatures Long oil, seal & equipment life Contains friction modifiers for limited-slip applications Mine is an automatic, but it clearly states ^^^^ |
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11-20-2022, 09:06 AM | #9 | |
Drives: 2015 zl1 m6 Join Date: Jan 2020
Location: Alaska
Posts: 702
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Quote:
Yep I know it had additive already in it . Amsoil themselves told me not to use it soo that good enough for me .. maybe you should give them a call I am all for amsoil - run the severe gear in my truck - both my vehicles are running amsoil tranny fluid ..
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791whp 699 ft lbs torque on E30 - ported sc /heads by boost mode racing - PAT G cam /Tune
PB:10.7 @133.9 |
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11-20-2022, 09:41 AM | #10 |
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I changed my ZL1 rear fluid at 16000 miles and it looked as bad or worse than that. I had an oil analysis done and it came back normal.
Anyways, I don't have any issues, but I did use the GM oil when I replaced. Of course I have a video of my fluid change on my channel if anyone is interested.
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11-20-2022, 11:01 AM | #11 | |
Drives: 2015 zl1 m6 Join Date: Jan 2020
Location: Alaska
Posts: 702
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Quote:
Thanks for the reassurance bro!! And as always I love your vids !!
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791whp 699 ft lbs torque on E30 - ported sc /heads by boost mode racing - PAT G cam /Tune
PB:10.7 @133.9 |
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11-20-2022, 12:18 PM | #12 |
Drives: 2014 2SS/RS 6SP Ashen Grey Join Date: Aug 2021
Location: NY
Posts: 1,264
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I never payed attention to what the ZL1 took, I wonder what the difference in the oils between SS Rear and ZL1. I drained the Factory Diff oil at 14K miles and went with Amsoil, I only had it in for about 100 Miles ( Zero issues and i did not add any extra additive ) After 100 Miles I swapped gears and went with a Tru Trac and And running a non synthetic Gear oil Toroco Brand. I did drain it after 500 Miles and replaced with same and mine looked like yours with the sludge which I am assuming was from Break in.
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GM 3.91/TrueTrac OEM ZL1 Rims, Brakes & Side Skirts.ACST4 Splitter/Deflectors NPP M2W,GM Short Throw,Remote Clutch reservoir
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11-20-2022, 01:45 PM | #13 | |
Camaro #4
Drives: 2017-Hyper Blue Metallic-2LTmanual Join Date: Dec 2015
Location: NE Ohio (Akron)
Posts: 1,210
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Quote:
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Don M
Supercharged LGX + 6 speed manual = FUN!! |
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