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There is lots on the internet about this 'popping'. Google landing jacks popping and you'll learn all about it. Essentially, there are 3 different hydraulic additives you can purchase for about $25 a quart. You take out a quart of existing oil and put in the additive. Improvement on our popping jacks was virtually immediate. Over 3 years, we have not needed to add any more additive. We purchased from Caterpillar. I'd provide you the product name, but it didn't come up almost immediately on my quick search.
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