Birkenstock don't oil their "oiled leather" properly. I grew up oiling horseriding saddleware and Birkenstock's "oiled leather" is dry & hard, not supple & soft. I do it myself. These are "Franca"
oiled leather birkenstock care
How to Clean Birkenstock Oiled Leather - YouTube
How to Take Care of your Birkenstocks | Grundy's Shoes
Womens And Mens Birkenstock Arizona Habana Oiled Leather - Happyfeet.Com
3 Minute Quick Clean and Care Guide Birkenstockㅣ Birkenstock London ㅣ 버켄스탁 - YouTube
Birkenstock Arizona Oiled Leather - Sandali Lifestyle | Neverland Firenze
How to Clean Birkenstocks | Reviews by Wirecutter
Birkenstock Arizona Oiled Leather Sandals | Black | TOAST
The Birkenstock Buyer's Guide | Sizing, Fit & Care | allsole
Shoe care and repair series: Birkenstock Shoe Cleaning - Oiled Leather - YouTube