GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Help with Comments on What to Check on a GL550

Old Jan 3, 2020 | 01:23 PM
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2017 C300 Cab 4Matic
Help with Comments on What to Check on a GL550

C300 Cabriolet guy here. I'm in OR and my son in CO is looking at a loaded '08 GL550 with 110K miles. He is not very car savvy. I'd appreciate input on reliability and things to look out for in that model that I could pass on to him. It's being sold by an indie used car lot so history is unknown. In the pics it looks excellent. Thanks.
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Old Jan 3, 2020 | 07:25 PM
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An X164 GL550 is not the easiest vehicle to own for someone who is not car savvy. A solution for lack of savviness is a willingness to pay a mechanic to repair the vehicle. It's an option for some people.

Unknown history is concerning. Purchase a carfax at minimum. Consider paying another independent shop for a prepurchase inspection.

List of well documented items on this site:

- GLs eat tires, particularly rear tires. This is because of the large amount of rear camber and toe specified by M-B.
- Check for leaking taillamp gaskets and leaking rear glass. Expensive electrical problems can result. Check in general for signs of moisture or dampness.
- M273 idler gear issues, the search button will bring you the information
- Air suspension can be problematic

Last edited by chassis; Jan 4, 2020 at 09:00 AM.
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Old Jan 3, 2020 | 11:37 PM
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NGL450 w/EORP, S550
Go pay to have that car undergo a Prepurchase Inspection at a nearby MB dealer - best $350 you’ll ever spend.

sit down when you get the repair estimate.
it’ll blow your socks off.

But then; factor in that only half of that hefty bill really needs done and; that it can be done for 60-80% of the cost at a good inpependent place.

altrnately post it up here and we’ll tell you what to prioritize first...

good luck.
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Old Jan 4, 2020 | 09:01 AM
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Updated the list of things to watch out for, adding the M273 idler gear.
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Old Jan 4, 2020 | 09:25 PM
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Originally Posted by chassis
Updated the list of things to watch out for, adding the M273 idler gear.
Not a factor in 2008, only for some 2007s.
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Old Jan 5, 2020 | 09:16 PM
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If your son is not car savvy I would stick with a Toyota/Honda product.
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