HRC's new look. Castrol was one of Honda's first sponsors in its first GP era in the 1960s. HRC has a lot of work to do in MotoGP right now. I wrote something about why it's behind & what exactly are its priorities https://www.motorsportmagazine.com/articles/motorcycles/motogp/why-motogps-japanese-brands-are-so-far-behind-and-what-honda-needs-to-do-to-catch-up/
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In 2000, merger/takeover by BP plc and Castrol (nominally) operates 'independently' in that organisation.
i hope they can come back to the fight for wins soon, MotoGP needs them
At least it's different enough from the Ducatis, and we don't have to tell them apart from GasGas.