No idea on why some do or some dont. It was the only jacks we had to do it with. All the other types / brands were fine. I suspect a few of them were made in China as well. The maratime law your mechanic talked about could have some merit. I dont know honestly. @GeeYou8 yes there is jack oil in a little bottle. Its no different to standard hydraulic oil. Just branded different. Nothing special about it.

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