The California Oil Museum at 1001 E. Main Street, Santa Paula (corner of Main and 10th) is the birthplace of Union Oil Company (aka Unocal and more recently acquired by Chevron in 2005). The building was completed on October 17, 1890. The museum was established in 1950, and the building was restored to its original appearance for its centennial celebration in 1990. Click here for an early picture of the building. The building is also a California Historical Landmark and is listed on the National Register of Historic Places.
The museum has one of the largest displays of vintage gas pumps in California. There is a turn of the century (20th century, that is) drilling rig, various displays, videos, working models and gas station memorabilia as well as rotating exhibits about science, technology and transportation as well as other more local exhibits on hand.
As of July 2016, admission is free; but suggested donation is $4. Open Wednesday to Sunday, 10 am to 4 pm.
More information at www.oilmuseum.net or 805.933.0076.