I did a fluid and filter change on my GLK250 last year and as I recall I also had the green stand pipe and used 113F. Its been 10K miles now with no issues.

Does your 2014 GLK have the auto-stop feature when you're sitting at a traffic light? As I recall there were some separate procedures called for in the trans fluid change process that were centered around disconnecting a remote pump package that mounted on the transmission pan? This pump apparently provides hydraulic pressure to the transmission when the auto shutdown is engaged and I was wondering if you had to face the issues of disconnecting the pump package and if so how it went?

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98 Dodge-Cummins pickup (123k)
13 GLK250 (135k)
06 E320CDI (323K)
16 C300 (62K)
82 300GD Gelaendewagen (54K)