Easy Sixt Status Match With Airline & Hotel Programs

I believe Diamond is available for status match with Flying blue Platinum Ultimate Status.

Just a warning for anyone considering Sixt - they are prone to blaming you for damage you did not cause. Meticulously document the vehicle's condition before you set off, use a CC with rental insurance, and even then good luck...

Document your car in as much detail as possible please. My experiences with Sixt is that they will find damage after you return the car and charge heavily. It took me over 6 months of communicatoin with them and only after just filing a complaint via my Amex they took the chargs away.
. Be aware!

I had a good experience with Sixt at LAX. Booked a full-size, but received a BMW 330 after mentioning my Platinum status at check-in. Got my status via status match from National Exec which I got from having CSR.

They match with TK as well (Elite -> Platinum), which is convenient given that TK elite is relatively easy to get. The discount is decent, but I've never been offered an upgrade even when one is available. Getting the miles credited correctly to a partner program is also a pain.

Reports are that once you status match with them, the match never really seems to expire. We had a couple of good experiences with Sixt in 2023. For one, they’ll actually give you the car class you want, unlike Hertz, which seems to use Five Star and President’s Circle as an excuse to make you pick from five random vehicles, none of which fit your needs for a trip particularly well.

Good luck with Sixt, great if nothing happens, but if you run into trouble, they do not respond. They also tack on charges randomly and do not respond if you try to question what the charges are.

Sixt has the best damn rental car fleet with luxury German cars rather than the "Premium" cars made by US automakers. Wish they were in more US cities.
Eg. Recently rented a BMW 5 Series with a lot of premium options and drove R/T from LAS to the Grand Canyon in 1 day at $75/day. Hell of a deal.
I have always rented from Sixt in Europe.... Wow, BMW's, Mercedes' ..... and any of the ones I drove were low mileage cars. (Recent Hertz President Circle rental cars had over 30K miles including 30K miles of wear and tear and dirt in the interiors).

Used this in 2021 to status match with my AF/KL Platinum and have consistently used them as preferred car rental company across EU (Netherlands, Germany, France, Italy, Denmark, etc...), Thailand and Australia.
By far have the best fleet available rental car wise (imo) and until now have only had good experiences.
Highlight was getting an M4 competition for 1 week when booking a VW passat as upgrade in Germany.
the upgrades are hit and miss thought apart from the occasional gems.