I just purchase a 2011 GL550 with 212K mikes - Mercedes-Benz Forum
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post #1 of 25 (permalink) Old 05-21-2019, 09:51 AM Thread Starter
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I just purchase a 2011 GL550 with 212K mikes

So I purchased a black 2011 GL550 with black interior with the factory TV entertainment system. The body and interior are in excellent condition.
The guy was about to trade it in for a new one, so I was able to purchase it from him for $4000.

It runs great but has a few issues that he was very open about but at $4k, that gives me a lot of wiggle room to deal with the issues. I will do most of the work myself.

First thing I want to do is change all of the fluid:

- Both differentials: Are you guys using Mobile1 75W90 for LSD? I hear its .5 quarts per diff.
- Transaxle: What fluid are you guys using and how much is needed?
- Oil: I'll run full synthetic using Mann filters.
- Power steering fluid: Do you guys just use the turkey baster method? Which fluid do you prefer? I've noticed the power steering whines while turning wheel.
- Brake fluid: I'll power bleed these to get out all of the fluid and put in new fluid.
- Transmission fluid & filter: I will have the dealer do that. From what I understand, this should only be done by the dealer and should cost about $300?

Mechanical things-to-do:

- Rear shocks are gone. It bounces all over the place like there are no shocks on it. Although it fares better when I switch it from Comfort to Sport mode. I will order some new Arnot rear shocks with ADS today.
- Replace valve cover gaskets. I've notice puffs of smoke coming from the rear of engine near the firewall that smells of burning oil.
- Replace serpentine belt.

Things I've noticed:

- When making sharp turns (mainly right turns) I feel a slight resistance/shutter. It reminds me of what was happening to my AWD Honda CRV. I resolved that issue by simply replacing the differential fluid and adding a bottle of LS additive. I hoping thats all this needs.

- If I accelerate slowly sometimes I feel like I'm driving on a cobble stone road. Last for about a second or two then its fine.

- During moments of acceleration (sometimes when driving straight but mostly when accelerating while turning) It feels like I'm driving on a cobblestone road. A passenger may not notice it but as the driver I do. It only last for a second or two.
- The transmission seamlessly changes gears and I don't hear any noises.
- The engine runs very smooth.
- Power Steering: does whine while turning steering wheel.
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post #2 of 25 (permalink) Old 05-21-2019, 09:54 AM Thread Starter
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OOps, I meant to post in the GL forum
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post #3 of 25 (permalink) Old 05-21-2019, 10:00 AM
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The cobblestone road effect is most likely the intake manifold flap issue. You can get the repair kit for that on eBay pretty cheap.

On the oil I use Mobil One 0w40 with Mann or Mercedes filters.

The transfer case should take the same blue fluid that that transmission uses. If it has never been done it will likely be black. Verify with your dealer potentially it can be done with your transmission service.

When you replace the rear shocks I would also verify the condition of your rear air springs as well.

Your front differential takes 85w90.

Your rear differential takes 75w85.

The transfer case and differentials are pretty much drain and fill.

Good luck.


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post #4 of 25 (permalink) Old 05-21-2019, 10:02 AM
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Transmission and transfer case fluid will be blue ATF 134 FE.


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post #5 of 25 (permalink) Old 05-21-2019, 11:00 AM Thread Starter
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Thanks a million for the info.

I've never heard of the intake manifold flap issue, I will definitely Google that....thanks again.
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post #6 of 25 (permalink) Old 05-21-2019, 11:11 AM
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No problem


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post #7 of 25 (permalink) Old 05-21-2019, 11:15 AM Thread Starter
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So this is what you were talking about correct? I'll look at my intake manifold tonight to see if any of those parts are broken.

https://www.ebay.com/itm/Metal-Intak...IAAOSwyJFcpcb0





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Originally Posted by james.calton1 View Post
The cobblestone road effect is most likely the intake manifold flap issue. You can get the repair kit for that on eBay pretty cheap......


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post #8 of 25 (permalink) Old 05-21-2019, 11:16 AM
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Thatís it.


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post #9 of 25 (permalink) Old 05-21-2019, 07:41 PM Thread Starter
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Tonight I changed the:
- front & rear differential fluid and I was happy to see the fluid that came out was still honey translucent color. There were no metal shavings or gritty feel to the sludge on the drain plug.

- Transaxle fluid was equally in good shape.

- I also suctioned the power steering fluid out of the reservoir and added new fluid.

After changing the power steering fluid the whine dramatically reduced, Still slightly there but much better.

After changing the differential fluids it appears to be doing much better although it could just be in my head.

Everything under the car looked to be in great shape with the exception of the transmission pan, it was very rusty. Looks like I will have the dealer install a new one when I have them replace the transmission fluid and filter. Anyone knows approximately what that may run for them to install a new transmission pan, drain & fill fluid and install filter?
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post #10 of 25 (permalink) Old 05-21-2019, 09:33 PM
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Dealership charged approx $750 labor to drain, clean pan inside magnet, change filter, flush torque converter & transmission oil cooler lines, refill with new fluid (approx. 7 quarts I think). They will use an additional 4 quarts of fluid for a flush vs drain & fill so total of 11 quarts will be needed to flush.


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