Legendary Disney animator Ward Kimball also drew on the side for antique-auto-enthusiast magazine the Horseless Carriage Gazette (and he contributed a lot over nearly 30 years: his name comes up frequently if you search for him in this index of the magazine). He also worked on custom ads for Mobil that ran in the Gazette, like the nice tattooed guy above, or this fun one with the Mobil Pegasus.
According to an interview cited by Cartoon Brew, an angry Walt Disney made Kimball stop contributing to the magazine, even though it was on his own time and for gratis. Thankfully these scans are cropping up on the Ward Kimball Facebook page, along with lots of other great stuff!