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I bought the 16oz size PolyLube 1000. When I first opened it it was full to the top. A couple weeks ago, I opened it again and found it collapsed in the container, shown in the picture.

enter image description here

Is it normal to collapse so much? It was warm when I first got it, and it was probably packaged at room temperature, but now it's around 30F. Maybe there was an air pocket, released as the grease pulled away from the sides of the container?

I've only used a volume of about five stacked quarter-dollars (two hubs' worth) dabbed from the top in the middle.

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    Yeah, there was a huge air bubble under there. – Daniel R Hicks Dec 27 '16 at 13:09
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    Grease is normally sold by weight not by volume. – Carel Dec 27 '16 at 13:55
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    You said it was 16oz and you've used some. What does it weigh now? – andy256 Dec 28 '16 at 0:06
  • Slightly more than 16oz, including container. Air bubble hypothesis still winning. – compton Dec 29 '16 at 10:22
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Looks like it was stored upside down at some point.

When you do this, the air bubble moves to the bottom and can take some time to return to the top.

See also, Nutella, Marmite and other viscous gloops.

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    Or faster to see, take a clear bottle with soft drink, upend it and the air bubble will go to the bottom of the bottle. When turned back right way up the bubble follows within a second. – Willeke Dec 27 '16 at 12:43
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    @Willeke Sure but with something as viscous as grease, it's not clear that an air bubble would move at all, so the demonstration with a very thin liquid like a soft drink doesn't actually show anything of relevance. – David Richerby Dec 27 '16 at 15:40

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