Strategic partner Audi led the series C round, which will support the expansion of airport car rental app developer Silvercar across the US.

Automotive company Audi led a $28m series C round for US-based car rental service Silvercar yesterday that included existing investors such as venture capital firm Austin Ventures and Facebook co-founder Eduardo Saverin.

Founded in 2012, Silvercar operates an app-based auto rental service focused on airports that aims to eliminate traditional bugbears such as lines, counters and paperwork, and which only uses silver Audis.

Silvercar disclosed the funding alongside the release of optimised versions of its digital and mobile platforms. It…