If its a mk2 equipped with the ea888 155kw be sure to budget around $1000 for a revised timing chain tensioner as these are a flawed design and a lot of mk6 gti are suffering from failure.... Get it changed before it fails and you end up with a munched engine
Along with the usual minor and major services at some time around the 100-150k you will want to get the upper engine walnut blasted as these motors are direct injection only which will cause carbon build up no matter what you do.
The ea888 gen 3 in the mk3 is a much better engine with both port and direct injection
Polo GTI
T-Roc R
Tiguan R
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