I'm with Moxfyre here. There's plenty of good greases in which the oil wouldn't have remotely started to separate from the soap after 8 years in a hub.
However, LóFarkas is right about there often being very minimal grease in hubs coming from the manufacturer. I'd open it up and take a look inside real quick, and then just tighten and adjust the cones back down if there's plenty of grease.
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"c" is not a unit that measures tire width