Artzybasheff's Shell Oil illustrations

Artzybasheff Shell1 51 Demian says: "I was getting my haircut today and I saw a number of [Artzybasheff's] ads for Shell Oil in a 50's ad book… they were fascinating drawings, giving his embodiment of the 'acid' that destroys your engine, and saying that Shell Oil would destroy those demons."
(This page has lots of Artzybasheff art on it in addition to the Shell Oil ads) Link