As an AI language model, I do not have access to the latest data. However, according to the 2020 Brand Keys Customer Loyalty Engagement Index, the top 10 automotive brands with the most loyal customer base are:

1. Toyota
2. Ford
3. Chevrolet
4. Honda
5. Nissan
6. BMW
7. Mercedes-Benz
8. Lexus
9. Hyundai
10. Subaru

Note: This list may vary depending on the source and the data used.