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4matic question

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Old Feb 28, 2021 | 03:19 PM
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2020 GLS450
4matic question
My GLS has 10k on it. All of a sudden it sucks in adverse weather. I was in the rain today (not heavy rain) And I was fishtailing all over the road at 50 mph

not sure what is going on. Not sure if my 4 wheel is not working. It seems like when it is raining or snowing, my car can’t keep straight on the road.

Any suggestions? How do I know if the 4 wheel is on? It’s very strange.
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Old Feb 28, 2021 | 04:41 PM
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That sounds dangerous. You should get that checked out immediately.

You can monitor the power to each wheel in the info screen.
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Old Feb 28, 2021 | 04:48 PM
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2020 GLS450
I’m bringing it in tomorrow for my A service and I’m going to ask. I just wanted to know if anyone else was having issues with their car in that type of weather. The car feels like it’s all over the road even in slightly windy conditions. I’m not sure what’s going on
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Old Feb 28, 2021 | 07:56 PM
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How do your tires look? Start with simple things. 22 or 23 inch performance tires do not last long. Rain should not be an issue even with 4-Matic if your tires as worth a damn. The vehicle weighs 7000 pounds even if it was only RWD it would not matter in the rain, unless your tires are toast.
Last edited by nova99; Feb 28, 2021 at 08:00 PM.
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Old Feb 28, 2021 | 07:58 PM
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2020 GLS450
I have the 20’s. They look in great shape.
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Old Feb 28, 2021 | 08:03 PM
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Well then to the dealer...still not convinced 4-Matic has anything to do with rain. If it was snow, ice, and slush on the roads maybe. 20 & 21's are all season so should be no issue there. Curious what dealer comes up with...keep us posted. Good Luck.
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Old Mar 1, 2021 | 04:26 PM
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Just to eliminate one variable and save diagnostic time at the Dealer, make sure the tire pressure is where you expect before going in.
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Old Mar 1, 2021 | 04:29 PM
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Faulty and defective Cooper tires. Cooper is paying for all four tires to be replaced. Hopefully that was the only problem. I will let you know once I get it back and drive it around
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Old Mar 1, 2021 | 07:18 PM
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Originally Posted by cazzara
Faulty and defective Cooper tires. Cooper is paying for all four tires to be replaced. Hopefully that was the only problem. I will let you know once I get it back and drive it around
Can you say how they diagnosed and confirmed the defective tires? Especially since they were fine for 10,000 miles.

I had an OE Pirelli go bad and just assumed I had hit something. I didn't even present it to the dealer.
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Old Mar 1, 2021 | 07:53 PM
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2020 GLS 450
Could you please clarify the problem with the tires? Did your service representative assist you in getting Cooper to replace the set? My GLS 450 has the Cooper Discoverer A/S tires (20") and two are nearly worn out with just 8800 miles. The worst wear rate I've ever seen on an OEM tire.
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Old Mar 1, 2021 | 09:15 PM
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https://www.autoblog.com/2021/02/27/cooper-tire-recall/
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Old Mar 1, 2021 | 10:23 PM
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2020 GLS450
I told my rep about the control issues I was having. He brought it to my attention and coordinated with cooper. I just had to pay the $100 mounting fee.
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Old Mar 1, 2021 | 10:38 PM
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Can you post photos of the tires? Or of one tire that is faulty?
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Old Mar 2, 2021 | 06:21 AM
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It must be the tires. I changed my tires to Michelins and the difference is night and day
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