GLC reliability



So far, here's what I've had done:
- 10k: replaced oil and filter
- 20k: replaced oil and filter, replaced engine air filter
- 24k: replaced run flat tires with Cooper CS5 Ultra Touring since the Pirellis were completely shot. I also had an alignment done as the wear on the Pirellis showed some uneven wear. New tires were a huge improvement and led to a much quieter ride.
- 25k: replaced cabin air filter
It's been rock solid for us so far.
Good luck on your purchase, and keep us informed on how it goes for you!
Your plan is a good one: get the extra warranties. The only suggestion I might make is to buy a low mileage CPO plus the extra warranties for a total of seven years unlimited mileage protection instead of six.If your car turns out to be anything like mine, you'll need it.
I'll be interested to read ChinaBob's report, with 100,000 miles his experience is most likely the most relevant to your question.
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I feel it would be a solid decision purchasing a GLC. We have a 2016, which if I am not mistaken, has the same base engine as the new 2019's? Mercedes-Benz likes the engines enough that they have now added them to the 2017+ E-Class as well. I would search the forum for common problems. Every car out there (yes, Toyota and Honda I am even looking at you) is going to have issues over a long ownership. Mercedes-Benz vehicles have WAY more computers, microswitches, technology, and complexity than a lot of other brands. These are meant for safety, comfort, efficiency, handling, etc. And when you add those areas up, it's tough to beat a Mercedes-Benz. If you are looking to save money, then look elsewhere. When parts start aging, you will definitely spend a bit more to maintain it properly. Now with that big disclaimer out of the way, here is our experience with our nearly 40,000-mile GLC300 4Matic:
* brake squeal issue when reversing in cold ambient temperatures - covered under warranty, and they have modified the parts once or twice and the complaints of this issue have fallen dramatically from most
* check-engine light, which turned out to be something like a breather tube related to the PVC system - covered under warranty. I've been told this part has now been redesigned like the brake pads. This doesn't render the car inoperative, but obviously needs attention. The mechanic needs to remove a number of parts to get at this. In other words, it's about a $1300 fix and is almost all labor cost.
* Windshield wipers are known to not wipe as smooth as they should at less-than-highway speeds. The fix for me has been using denatured alcohol on the blades every month or two. No problems since.
* Extended-mobility tires just suck in general and will NOT give you a good ride. We switched out of them at 19,000 miles or so and went with a standard Continental tire. I added a GLK350 (2010-2015) model spare tire and emergency kit with inflator in the lower trunk for protection. We actually got a flat a few months after switching to this combination and used the spare tire. Mercedes-Benz is not the only company that utilizes the extended-mobility tires. As others will confirm, getting rid of them will improve the ride immeasurably.
* I've read about people having issues of the tires skipping and such during tight turns in rain and snow at slow speeds. In fact, I read there was a lawsuit in the UK or something. Here's what I have found: The front wheels on this car turn much more than any other car I've ever owned. This allows one to make a very sharp U-turn. BUT, you have to be careful with slick tarmac and NOT turn the wheel all the way to the limits when the tarmac is slick.
* You'll read about people not getting good rides. Most of the complaints are because people's tires are WAY overinflated. The recommended cold tire pressure is something like 46 for the rear and 38 for the front. I consulted with a dealer and we agreed 38 all the way around. Probably a bit less in the winter if driving in snow. 46 psi will guarantee you a rough ride.
* The transmission would lag when you coasted through a turn and then applied gas coming out of the turn. They fixed this with a software change a couple of years ago and should not be a problem on any of the 2018 or 2019's.
* Mercedes Me iPhone app is unreliable and slow, but every Mercedes-Benz owner can tell you this. They even sent an email out to owners to apologize for the app not being up to their standards. I've got it to work about 90% of attempts or more on remote starts, but the damn thing can take nearly 2-3 minutes to get the start signal to the car. With that said, a true car person will tell you that idling your car for more than a minute is not the best for your engine (or the environment). It dumps more fuel into your cylinder and enriches things a bit more than desired and reduces life of the engine. So, we don't use the feature unless we are coming to the car in sub-zero temperatures and it's been sitting all day or more. This isn't very often for us.
* The other thing I would recommend with these 4-cylinder turbo engines is change the oil more often than what the manual says. 10,000 between oil changes is too much in my opinion. The synthetic Mobil 1 oil used looks like water when it comes out at 10,000 miles - not good. I feel it is worth the long-term health of the engine to change the engine oil every 5,000 miles. If you don't drive much, never let the oil go more than 1 year between changes, as time can impact the quality of the oil as well.
* The engine from the outside sounds a bit like a diesel engine, albeit a quiet diesel. However, once inside the cabin, you won't hear a peep.
* Some people are annoyed by the run stop engine. You can deactivate it after every start, or purchase an OBD II chip off eBay for $100 or so and permanently disable it (although I would do this until the car is to of warranty, but that's just me). Putting that much wear on an engine with all of the extra starts just can't be good over a 15-year period. Not to mention the increased chance of having a starter motor replacement within 10 years.
Some are annoyed by the touch-sensitive controller AND a rotary knob. Personally, we went into Settings and disabled the touch-sensitive controller. It's nothing but a place to rest your hand while using the knob now. Not sure why Mercedes-Benz still has two controllers next to each other still.
Now for some positives:
I just drove home from work last night after midnight and drove near the speed limit (45-55 mph most of the way for an hour) and averaged 35.6 mpg in Eco mode. And that was even with the AC on for about the first 90% of the drive. So, if you drive slow and steady, this car is massively fuel efficient. Of course, I had the advantage of no traffic at that late hour. Wife averages about 23.5 mpg for her 4-mile trip to work on city streets (lots of stop signs and stop lights). Car gets about 28-29 mpg on the highway if you do 70 mph.
The car is VERY quiet. The front 3 panes of glass are "acoustic glass", which seems to help.
The doors close better than any door I've every closed in my entire life. This isn't on all Mercedes-Benz, mind you. The 2016 E-Class doesn't close as well. The 2014 S-Class doesn't close as well. Although the newer versions of these last 2 probably close as well as ours, there is something they figured out with the doors that they started doing on the recent few years of models.
The car makes a lot of little purrs and quiet motor and fan sounds as you leave it or even approach it. The tech in this car just amazes me.
The door hinges are bolted and welded - not normal for car companies to do that
The subwoofer speaker is mounted on the firewall above the driver's feet - brilliant.
The rear seats lay perfectly flat when you put them down. Why can't most car companies design this into their cars?
The Best of Mercedes & AMG
Dennis P.




And at 50k miles change engine air filter by yourself 10 minutes to change again look on YouTube. Dealer wanted $150 to change. Mann air engine filter on Amazon 20 dollars.
The satellite radio wouldn't work some mornings. Fix: Turn the car off, get out, lock it, walk far enough away the car doesn't sense the key, get back in, it works.
3 times one of the front parking lights came on while parked in my carport at night.
A clattering noise developed in the dash behind my left air vent on cold mornings, like a vent valve or door was trying to open. Lasted maybe 2 minutes then went away.
Light behind my fuel gauge was too bright, one behind temp. gauge too dim.
I assumed this might be because 2016 was the first model year and mine was one of the first built (my previous lease was up). When the GLC lease was up, I went to a 2019 GLE 400 (I had leases 3 MLs before the GLC). .
The satellite radio wouldn't work some mornings. Fix: Turn the car off, get out, lock it, walk far enough away the car doesn't sense the key, get back in, it works.
3 times one of the front parking lights came on while parked in my carport at night.
A clattering noise developed in the dash behind my left air vent on cold mornings, like a vent valve or door was trying to open. Lasted maybe 2 minutes then went away.
Light behind my fuel gauge was too bright, one behind temp. gauge too dim.
I assumed this might be because 2016 was the first model year and mine was one of the first built (my previous lease was up). When the GLC lease was up, I went to a 2019 GLE 400 (I had leases 3 MLs before the GLC). .




