Puzzled about old Valvoline advertising

Joined
Sep 4, 2015
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816
Location
Munich, Germany
Gentlemen,

some time ago i went with my Bike buddy out for a Burger. The decoration in the Restaurant contained some old advertising signs. One was for Valvoline oil.
What puzzels me was this sort of "Swiss Cheese-3/4 Moon-Strainer" in the middle. We where joking about it a little bit, but we dont get it what it should depict. When you do a internet search, you see that this symbol was used at the Early years of Valvoline.

Because i am a nerd of some sort i am curios. An i think this is the right place to ask. Could anybody explain what this symbol should be?
 

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