Synpower, versus Mobil 1, versus super lube. Is there any stand out here?

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Oct 8, 2014
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I've been helping a buddy prep a pop-up camper for use. It has one of those Dexter axles with the easy lube system, and I'm pretty sure the previous owner just threw whatever grease he had on hand in there.
So we've got an apartment we're cleaning it up and I figured now is as good a time as any to switch to something better.

He likes to drive fast. He's mostly using it to drive several states away to go visit family, And if he needed to move it in the winter time it does need to handle cold temps.

Anyway these are the three greases that are easy enough to get around me. They all seem to have similar specs, is any one better than the other two?
 
Similar specs? What does that tell you? If there is one that is branded synthetic it potentially has better cold temp abilities but again it is the specs.
 
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