My bike has about 30,000 miles on it and it's time to overhaul the suspension. To avoid having to send out the shock to have it overhauled I recently picked up a used ES shock with just 7400 miles on it. It's super clean looking with no signs of wear. I figured I can just bolt it on and ride given its mileage and condition but wanted to get some other opinions first whether it's worth changing the gas and oil in it.