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

GL550 rpm @ 70mph?

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Old Mar 25, 2019 | 01:38 PM
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2010 GL550
GL550 rpm @ 70mph?

I have a 2010 GL550. It is new to me. When interstate driving, and going 70 mph my RPM are running just a touch over 2000. Is this about right? I would think it might be a little lower with a 5.5, but then again, with the truck's weight... What are you getting as far as rpm @ 70mph? Thanks, Bo
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Old Mar 25, 2019 | 02:10 PM
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'08 GL 320 CDI
I don't know how many speeds your tranny is... 7? But that sounds about right? Count your shifts, starting from a standstill. Do you get into top gear? Does the torque converter lockup (somewhere around 45-ish mph, usually)? If all of those things are good, then you're good.
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Old Mar 25, 2019 | 03:10 PM
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2010 Mercedes GL450; 2000 Mercedes ML55 AMG; 2016 VW GLI SEL Stick!!!
Originally Posted by iamgobono
I have a 2010 GL550. It is new to me. When interstate driving, and going 70 mph my RPM are running just a touch over 2000. Is this about right? I would think it might be a little lower with a 5.5, but then again, with the truck's weight... What are you getting as far as rpm @ 70mph? Thanks, Bo
Nothing to do with engine. Everything to do with tranny and final gear ratio.

2000 rpm sounds right.
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Old Mar 25, 2019 | 04:47 PM
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2010 GL550
Just got back from a multi-hour highway drive yesterday actually, and was actually looking - and was just about on the 2000 rpm dot myself at 70 mph.

EDIT: Way home tonight, and 70 mph was reading at about 2080 RPM on average, on Torque. That was at the indicated 70 on the speedo.

Last edited by CharlzO; Mar 25, 2019 at 10:34 PM.
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Old Mar 25, 2019 | 10:27 PM
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2010 Mercedes GL450; 2000 Mercedes ML55 AMG; 2016 VW GLI SEL Stick!!!
Just came home and drove the gl and 150kph is just at 3.5k rpm

Not surprising to hear that 70mph is at 2k rpm.
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Old Mar 26, 2019 | 01:42 AM
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NGL450 w/EORP, S550
Originally Posted by iamgobono
I have a 2010 GL550. It is new to me. When interstate driving, and going 70 mph my RPM are running just a touch over 2000. Is this about right? I would think it might be a little lower with a 5.5, but then again, with the truck's weight... What are you getting as far as rpm @ 70mph? Thanks, Bo
Right around there depending on tire diameter...

One way to make sure you're in 7th gear is to manually trigger the left paddle switch down to D6, then right paddle back to D7 (or D) and see if the RPMs drop.
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Old Mar 26, 2019 | 08:01 AM
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2010 GL550
Paddles

Thanks... Will try. But, I think everything is right on. Bo
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