Originally Posted by Wiggums
Okay, just did FRA.. and I am 0 out of 5 for upgrades as a Sixt Platinum. AMS - 0 for 2, LHR 0 for 2, and now FRA 0 for 1.

What am I doing wrong?
I think the best way to get an upgrade is, when you use "Sixt's call before service" - it's called Sixt Express, and you also get 2,000 Miles & More miles.
Die Handy-Service Nummer: + 49 (0) 180 – 5 00 22 02