2015 GLK 250 Bluetec Transmission Schedule
Thread Starter
Junior Member
Joined: Apr 2018
Posts: 21
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2015 GLK 250
2015 GLK 250 Bluetec Transmission Schedule
Noob here, so please be gentle. And yes, I searched the forums and couldn't find a concrete answer. 
Looking at a CPO 2015 GLK 250 Bluetec with about 30k miles, but have an issue with the transmission fluid and filter service schedule.
Researching online I found that the MBUSA Maintenance Booklet for 2015 says under "Additional maintenance work" fluid at 30k for diesel "Automatic transmission NAG2 only: oil and oil filter change (engine 651) Please note the instructions in the workshop information."
Yet the dealer swears it's 6/60k on tranny fluid and filter, and has provided documentation for the "204.9" Model. Not sure what the 204.9 means, but appears to be GLK.
Appreciate any help clearing this up, as my current plan is to close on this vehicle on Monday.
Many thanks!
Looking at a CPO 2015 GLK 250 Bluetec with about 30k miles, but have an issue with the transmission fluid and filter service schedule.
Researching online I found that the MBUSA Maintenance Booklet for 2015 says under "Additional maintenance work" fluid at 30k for diesel "Automatic transmission NAG2 only: oil and oil filter change (engine 651) Please note the instructions in the workshop information."
Yet the dealer swears it's 6/60k on tranny fluid and filter, and has provided documentation for the "204.9" Model. Not sure what the 204.9 means, but appears to be GLK.
Appreciate any help clearing this up, as my current plan is to close on this vehicle on Monday.
Many thanks!
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Joined: Jul 2012
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From: WI
GLK 250
Reading my 2014GLK250 maintenance schedule, it says "70,000 miles or 7 years -> GLK -> Automatic transmission – oil and filter change, except for E 400 HYBRID (engine 152, 271, 276, 278, 279, 642, 651)"
Our 250 BlueTecs being the 651 engine. I did ours proactively at 62K, and the fluid was more than ready to be changed.
I don't think there is any difference in the drivetrain between 2014 and 2015 GLK250s
In short, at 30K miles and CPO, I wouldn't worry about it. I'd focus on the more probable exhaust-related issues (like service history showing any repairs of NOx sensors, DPF, etc.)
When warranty runs out, those are your most likely money pits with these trucks.
Good luck in your search.
Our 250 BlueTecs being the 651 engine. I did ours proactively at 62K, and the fluid was more than ready to be changed.
I don't think there is any difference in the drivetrain between 2014 and 2015 GLK250s
In short, at 30K miles and CPO, I wouldn't worry about it. I'd focus on the more probable exhaust-related issues (like service history showing any repairs of NOx sensors, DPF, etc.)
When warranty runs out, those are your most likely money pits with these trucks.
Good luck in your search.
Thread Starter
Junior Member
Joined: Apr 2018
Posts: 21
Likes: 2
2015 GLK 250
Your change schedule agrees with what we've been able to nail down as well, so feeling solid on that. Thanks!
With respect to the exhaust, there is no work noted on the sensor nor the system as a whole. In fact the only reported services are regular maintenance, the recall for the Chain Tensioner Gasket, a replaced washer pump, and the items required to get it up to snuff for CPO.
Thanks again.
With respect to the exhaust, there is no work noted on the sensor nor the system as a whole. In fact the only reported services are regular maintenance, the recall for the Chain Tensioner Gasket, a replaced washer pump, and the items required to get it up to snuff for CPO.
Thanks again.
