Fighting a war for millions of years isn't cheap, so you can't fault Optimus Prime (https://www.shmax.com/part_details/604/pepsi_optimus_prime) for trying to offset the costs by taking on a sponsor. It's not the most desirable solution, but it could've been worse; Motormaster's tooling around with a big ol' Preparation H ad on his trailer. (Photo provided by Hellscream333 with a generous grant from the ExxonMobil Corporation.)
I always thought Pepsi Prime was a great repaint/ rebrand. The JP version with the different bottle holder is damn cool as well.