Square with "G" in the middle on bottom of bottle?

[G-MAN]

Can someone confirm that bottles of oil that have a square symbol on the bottom with a "G" in the middle are made only by ExxonMobil?

 

[y_p_w]

Likely the symbol for the bottle manufacturer.

 

[y_p_w]

I took a quick look in the garage. Mobil 1 5qt jugs had the "square G", as did the Chevron 1 qt bottles. The Mobil 1qt bottles had a 3-C symbol. It's just whoever they contract for bottle manufacturing.

 

[mechtech]

I worked at a blow molding facility [make plastic bottles].
It's the company logo, or mold number.

 

[Blue99]

The "Box G" logo belongs to Graham Packaging, one of the larger players in the automotive chemicals packaging industry.

Another is Consolidated Container Corp with the CCC logo.

These larger companies offer contract packaging services with blowmolding of bottles at the blending site. Bulk plastic resin is cheaper to ship around the country than molded bottles, which, by volume, are mostly air.

See the Graham Packaging Link for more info.