Audi R8 LMS 2018 Handbook page 23

100 – Engine Ancillaries, Oil Tank and Water Cooler
Attention
The oil filler cap with quick release coupling is part of the endurance
homologation VO (VO -Variant Option).
When using a system, which is homologated together with other systems in a
single VO, the full extent of the homologated components must be used.
Please check the relevant VO in the homologation to ensure the assembly
complies with the regulations.
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Version 1 2016-01-01