12-05-2019, 08:55 AM | #1 |
Drives: 2019 ZL1 Join Date: Oct 2019
Location: GA
Posts: 573
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eLSD Drain and fill on a 17+ ZL1 A10 - DO IT TWICE!
Just a PSA to tag onto the excellent threads/video posted about changing the eLSD fluid. You definitely will want to do it twice to get all the break-in metal and crap out. The first eLSD fluid drain at 1900 miles was completely opaque, grey/silver and metallic like a paint job. There was accumulated metal on both the fill (tiny bit) and drain plug (ton) each for the eLSD. My understanding is this is normal and no odd sounds/issues on the car but I wanted to clean it out for sure.
Since the job is super easy on a lift, I went ahead and bought 4 bottles of the GM fluid so I could do a 2x drain and fill to make sure its cleaned out really well. I wasnt confident that pouring in a little extra fluid to "wash" it through would get as much out so I got four bottles up front. The pics attached are of the 2nd drain, not the 1st, showing that there was a big improvement from the solid/crazy thick first drain but still plenty of stuff to flush out after 50 miles of driving on the 1st re-fill. I'd say the first flush got 60% of the stuff out and the 2nd got another 20-25% more, given that it was translucent and still colored/bit metally but not as much as the first at all. The fluid going in fyi is transparent completely and lightly yellow in tint. Pics of the 2nd drain here so you can see there is still some metal and crud to get out after one drain/fill. I wont be doing another as it seems unnecessary but super glad I did this twice. |
12-05-2019, 10:14 AM | #2 | |
Drives: '19 ZL1 1LE A10 ShadowGrayMetallic Join Date: Mar 2019
Location: California
Posts: 185
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12-05-2019, 10:44 AM | #3 |
Drives: 2018 ZL-1 Join Date: Jan 2018
Location: Albuquerque
Posts: 953
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Fluid is cheap, diffs are expensive.
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12-05-2019, 11:01 AM | #4 |
Life's Short, Live Fast!
Drives: 2017 Hyper Blue A10 ZL1 Join Date: Nov 2016
Location: London, KY
Posts: 2,015
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Looks like he drove it 50 miles between refills.
I changed mine right before my first road course event. I thought about changing it again after the event, but I haven't. I might ought to.
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Life's Short, Live Fast! https://youtu.be/rTUv2p4T7OA 10.94 at 128 mph, 11.13 at 127mph 870 DA, https://youtu.be/e_X_LcpFp50 11.19 at 127mph 1100 DA, https://youtu.be/OXQiCQdQuH4 11.40 at 125mph 1800 DA
https://youtu.be/uWba1qs8M6Q 11.52 at 123mph 3500 DA TZQPHG '17 ZL1 HBM|A10|Nav|PDR|CFW Hood|ZL1 Mats 12/26/2016 Ordered! 2/8/2017 Built!! 3/2/2017 Brought Home!!! |
12-05-2019, 08:18 PM | #5 |
Drives: 2017 Camaro ZL1 Join Date: Nov 2019
Location: al
Posts: 93
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I posted a video of my fluid change. I always pump some clean fluid in with the drain plug out to help remove more contamination from the case bottom. I do this with any fluid change.. oil, rear end, trans, etc.. Been doing this for years.
I did contemplate disconnecting the lines and trying to drain those as well as the pump for the ELSD but didn't want to risk messing anything up.
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2017 ZL1 M6
Youtuber - https://www.youtube.com/c/projectzl1 |
12-06-2019, 06:26 AM | #6 |
Drives: 2019 ZL1 Join Date: Oct 2019
Location: GA
Posts: 573
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Yes indeedy, drove a good 50 miles to get most of the particles into suspension after the 1st refill and then drained all that out as well and refilled a second time. It could just be me, but the car seems a bit peppier with the double drain/refill, throttle response wise. Doubtful, probably placebo, but it does.
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12-06-2019, 09:51 AM | #7 | |
Oh Oh it's Friday Night!
Drives: 2018 ZL1 1LE Nightfall Gray Join Date: Jan 2018
Location: Walton Woods
Posts: 1,064
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Quote:
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2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm
Four that wanna own me Two that wanna stone me One says she's a friend of mine... |
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12-06-2019, 10:17 AM | #8 |
Life's Short, Live Fast!
Drives: 2017 Hyper Blue A10 ZL1 Join Date: Nov 2016
Location: London, KY
Posts: 2,015
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Funny how that works, isn't it? I feel the same way after fluid changes, a wash, and especially a wax.
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Life's Short, Live Fast! https://youtu.be/rTUv2p4T7OA 10.94 at 128 mph, 11.13 at 127mph 870 DA, https://youtu.be/e_X_LcpFp50 11.19 at 127mph 1100 DA, https://youtu.be/OXQiCQdQuH4 11.40 at 125mph 1800 DA
https://youtu.be/uWba1qs8M6Q 11.52 at 123mph 3500 DA TZQPHG '17 ZL1 HBM|A10|Nav|PDR|CFW Hood|ZL1 Mats 12/26/2016 Ordered! 2/8/2017 Built!! 3/2/2017 Brought Home!!! |
12-06-2019, 02:17 PM | #9 |
When I changed my diff fluid at past 1500 miles it looked almost like new, I can’t understand the difference when I see the pics and reports of the dirty fluid many have at that mileage.
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12-06-2019, 02:26 PM | #10 |
Drives: 2019 ZL1 Join Date: Oct 2019
Location: GA
Posts: 573
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I cant explain it but mine was silver opaque metallic milk. Good for you though no bs, save a few bucks!
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12-06-2019, 02:33 PM | #11 |
12-06-2019, 09:22 PM | #12 | |
Drives: 2017 Camaro ZL1 Join Date: Nov 2019
Location: al
Posts: 93
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You can see in this video how mine looked like sparkley chocolate milk at 2500 miles. It should start where the fluid is coming out..
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2017 ZL1 M6
Youtuber - https://www.youtube.com/c/projectzl1 |
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12-07-2019, 07:17 AM | #13 |
Drives: 2019 ZL1 Join Date: Oct 2019
Location: GA
Posts: 573
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Same here indeed. It's such an easy job I might do it again at 5000-7500 miles just to make sure she's all set and then maybe once every two years.
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