Roni07

- be carful with under inflated tires. Especially with the performance fires - it will eat them up - uneaten wear and tear- it happened to me - had to get new tires. 💵. One user here corrected unwavering wear with inflation to 40psi. I don’t know why but nothing seems to make sense with MB. Even MB HQ Says getting 10K miles on a brand new set of tires is perfectly acceptable and within spec. Nothing wrong. No off road driving, don’t race, don’t burn rubber. I drive very little a day - some city and some highway , mostly within 20 miles radius. These are the tires MB chooses to put on their vehicles, so many stock tires complains on this board. MB Very special brand -watch me spend $2,500 every 10K mikes on my GLE350. Never buying tires from the dealer again. Going to tire rack Walmart Costco Sams etc

Roni07

How’s your experience with the Macan S compared to the MB ?

Roni07

- I experienced this on my wife 2017 GLC300 - when backing up and turning all the way, either right or left, there’s a popping/ slipping / skidding. Very weird. Showed it to the dealer - they say that normal no problem. I guess we’ll have to live with it and chose a different brand next time.

ParjAS

I heard that there was some suspension tuning issue on a couple GLCs. ????????????

dauble2k5

Interesting about the tire pressure temps. Ours was in for its annual service and I requested the tires be rotated and balanced. The dealer inflated the tires to 40psi in front, 41psi in rear. However, what I find curious is the door jams and fuel door say the tires should be inflated to 30/35 (if I recall correctly), for the stock 18/19 and 20" wheels. I will also admit that I keep them inflated to around 32/35 (whatever the door jams say) and noticed the ride is substantially improved.

Any ideas why MB dealers inflate them so high?

Roni07

- Good observation. I swapped my C300 loaner for a GLC300. Love the GLC ride so much better than C class. Talk about confusion. Straight from Mercedes. The fuel door says to inflate tires to 32psi , However the door jam says to inflate tires to 35psi. Absolutely ridiculous. I keep my tires at 35psi due to heat I. Texas. Some folks on here have claimed that inflating to 40psi or even 45psi seems to correct uneven wear. I checked the loaner tires and the back tires were at 45psi and the front at 41psi. Don’t know why the dealer inflate my tires at 33psi but their cars at 41. Hope it’s not to wear off my tires so I buy more tires from them. Their have a tire specialist, who walks around the customer’s service vehicles and checks tires them he does his tires speech trying to sell them new tires. ?!?!?!

tGs Wraith

I believe higher pressures reduce crabbing. My dealer recommended 38 PSI to reduce some mild crabbing noticed in reverse (MY20 so post knuckles). I found the car seemed a little more "solid on the road" with higher pressures due to less sidewall flex (even with RFT) so I keep them around 36 PSI vs the 32 mentioned in the fuel door. Even at 32 if you hit a speed bump faster than 28kph you lose some teeth, the bump stop travel is too short, but thats not really altered by running the tyres at a higher pressure

wesram

As a follow up on my previous post, screw mercedes if they say this is normal. Today I was driving on a highway and I noticed from far that there is a bridge connector. Knowing what this ****ing car's suspension is, i warned my wife and kids to embrace the impact and lowered my speed to less than 60 kph, risking the drivers behind me hitting my car. Despite this, the car slammed so hard and bottomed down I felt the front collapsed, unbelievable behavior from a 75k usd car. Can't wait for the 2nd of September to see what the dealership will answer. But overall, screw u mercedes for delivering such a crappy car.

dauble2k5

It sounds like we're experiencing slightly different, albeit related issues. You and others have mentioned the suspension feels like it's bottoming out, right? The problem we (and others) have noticed is more of the crabbing, and general feel of instability. When the suspension feels like it's fully compressing, does it feel like the car's shimmying around in the lane, and do you feel vibrations in the wheel, also? What kind of tires do you have, and are they RFTs? We have Pirelli Scorpion RFTs. I will not be going with them again. We have 15k on it so far, and I've heard they only last between 20-25k, so I'm looking forward to replacing them.

One other thing I have actually noticed, is changing the drive mode from Comfort to Eco, waiting until the COMAND screen goes back to normal, then going back into Comfort seems to make the crabbing feeling better. So, I'm inclined to believe what others have said in terms of a software fix - I'm starting to think the computer's limits are out of whack and need to be addressed. Have others noticed any improvement when changing drive modes?

wesram

To be honest i don't have any crabbing issues, and the car is stable on the highways and feels very steady as long as there are no bumps or pits. however, the moment you hit the slightest bump or man-made pits, the car is very unsafe and bottoms out or /and the wheels vibrate like no tomorrow. the weird thing is that u dont feel any of this in the steering wheel, just a general feeling from the tires and definitely from your teeth and body.
I have regular tires (Not RFT), Michelin 20 inches all weather.

Roni07

Our own 2017 GLC300, 20 in rims , when lock turning the wheel, and backing ion, right or left - there’s a sliding skipping, bumping type of sounds. No body at the dealer can figure this out. We’ve never experienced that with any other vehicles. So now we have a 2020 GLC300 loaner, 18 inch rims. And noticed the same behaviour when backing up, with steering whee locked in either left or light position - car is skidding slipping. Not going fast. 5mph. Very weird. I have some serious doubts about MB quality. This is not normal.

wesram

yeah same here when I steer left or right to the extreme. But the skipping or sliding isn't much to annoy me as the other issues I mentioned before. I feel the same regarding the quality of mercedes and expensive cars they are selling.

Roni07

- dealer says it’s normal and no issues. Biggest mistake buying Mercedes. I told my wife MB are very expensive, terrible quality and reliability - MB is not what it used to be. It’s a money pit. MB HQ doesn’t care either. We’ve just accepted it to live with these issues. They’ll both be paid off next year, so we’ll trade both of those turds for probably a Tesla X for me and a Tesla S for my wife.

wesram

so yesterday I dropped the car at the dealer. He test drove it and acknowledged silently the issue. Today they called saying computer isn't showing any issue and to come take the car!!!! Going there and most probably you will hear my voice across continents.

Roni07

- unfortunately Mercedes doesn’t care if we scream 😱 it’s really too bad. I was driving GLE350 4Matic with my wife in the front seat, doing 70mph. My wife said omg I feel the vehicle shaking. Super disappointed. I told her that’s how’s it’s been for year and the dealer - roared balance and I even paid for new tires - still shakes and passengers can feel the vibrations. Great job Mercedes all of this for $75K !?

arrow mallow

I can confirm the same thing happens to my GLC300 2018 4matic with 19 inch run flat tires.

The service tech drove my car with me in the passenger seat but refused to say they can feel the steering wheel vibrate and the skidding skipping sounds.
They called a "senior mechanical engineer" who drove my car again and gave me a lesson for 20 minutes explaining how this is normal and is because the road were I park can be slippery and all sorts of excuses.

To me that issue is not as annoying as the pothole/manhole described in this thread. Thankfully I haven't noticed that on mine.

Roni07

- it’s a skidding / sliding sound bumpy , only when locking the steering wheel- right or left. I’ve never experienced this with any other vehicle. We have the run flats. Don’t know if it’s the tire or the position of the wheel. MB front wheel sort of Tilt to the side when turning to reduce turning radius. But of course MB dealer will blame the road and not the car. Absolutely ludicrous.

ParjAS

I haven't experienced anything like this on my 2019. I have liked the way it drives.
This was a post by user ChinaBob, I think you might find it helpful.
That’s a pretty tall order but I’ve been curious about it myself so this is a good time to do it, especially now that I have the car for sale. I left out normal maintenance but included big ticket items. Anything with a dollar amount I paid myself, the rest was under warranty.
~ 3700 - I picked up the car, CPO, former service loaner

~ 5000 - Took car in for two problems:
Front wheels bouncing and even becoming airborne over broken pavement. A common problem reported on the forums. The dealer took the front suspension apart and the problem got better but did not go away completely until I replaced the tires with non-run flats at around 35,000. (My guess is that M-B engineers forgot to tune the suspension for run-flat tires.)

Excessive wind noise, also reported on forums. Dealer installed acoustic glass in front side windows. Huge improvement!

34,811 - noise in dash when cold. Heater blower replaced

35,021 - new tires - Michelin Premier A/S $1040

46,244 - rattle in right rear cargo area. Left rear speaker falling out, fixed with some bushings.

61,627 - Blind spot monitor out. Replaced warning light in right mirror

78,693 - Replace V-belt - $171 out of pocket; change transmission fluid $498 (should have been ~$800 but Miami M-B dealer quoted me for a 2-wd not realizing a 4matic costs a lot more); leaking engine mount covered under CPO

88,230 - PCV malfunction. Replaced

97,422 - Replace rear brake pads and rotors - $686

101,737 - Right front axle seal leaking

104,795 - Replace front brake pads and rotors - $840.93

113,522 - Replaced Michelin tires with Pirelli Scorpion Verde A/S - $873. (Michelin had 78,000 miles and had maybe 10k more left in them but I was headed out for a long trip in the winter.)

142,110 - current mileage

Now that I look at the whole record I realize it’s not so bad. By putting on so many miles in so short a time it seemed like the repair record was worse than it really was.

ParjAS

Look at the 5000 section.

Roni07

- When did you do spark plug replacement ?
Also did you do B services 4, 5 etc ?
Front Brakes ?

ParjAS

That's ChinaBob s not mine. I won't know.

wesram

so to update you guys, i didn't have to yell or scream. Since the maintenance manager i know was hospitalized, another manager from the other dealer workshop came to meet me. to my surprise he was very understanding. fast forward, we tested the car together and he agreed that something isn't normal although most of the issues i mentioned are more or less car characteristics. nonetheless, he advised to keep the car in the workshop to do some testing, but he arranged another same car for me to test drive and see if the same issues will pop. guess what? we noticed the same issues and mainly the rough ride and bottoming up! the test car had smoother ride on the highway with less road noise, and also park assist brake noise was completely silent. Despite similarity, the maintenance manager kept the car and promised to work on it to as much as possible to bring to my satisfaction. They provided me with a replacement car (GLE 400 2018 SUV - a beast that ticks all marks - i love the engine sound and acceleration but hate the lack of technology in the car).

yesterday got an update that the tires have flat spots on it and that sales in the agency refused the maintenance suggestions to change. now they went back to Michelin dealer to ask for replacement, and if that wont work, maintenance promised to force the sales team to buy new tires (any suggestions? many are advising to go with continental). Meanwhile, they are trying to play with the dumping system for the suspension system, and clean the brakes to see if other issues will fade. last option for the suspension is to replace with air suspension but that would be a very long shot that the manager would not recommend, as it will entail extra cost for me.

expecting a call today for an update, crossing my fingers for good news. i miss my car.

ParjAS

ENJOY! Hope you get your car back in good health and maybe buy yourself that GLE400...

wesram

so just an update guys, finally got my car back and here is the result:
1- the whooshing sound was gone after they changed the wheels with Continental sport compact XL Non RFT.
2- drive is smoother and small pits are much better handled by the car.
3- bumps and bottoming up is almost the same and i have tested 2 other identical cars where i experienced the same thing. seems charachteristics of teh car.

hopefully wheels will last longer than michelin.

Benzgurl#1

I changed out my run flats with Michelin’s premier Ltx and have the same problem. I just leased this vehicle and this problem is really bothering me.