This is co-worker of mine, I would not state as a friend, rather a work acquaintance at best. He is one of those annoying folks who knows more about things than everyone else. I did not mention synthetics as a replacement oil choice, rather an oil of known quality. And no, this individual does not work for a jack company, because if he did, I would work for one as well and not have the need to ask such a question on a semi public forum. If any of you have any doubts to the above, please read my original unedited post. I was merely trying to use this as a sounding board to see what others think. I use Mexican made Enerpac bottle (not floor jacks folks) jacks for my company trucks. The manual says if the bottle jacks are to be used for heavy constant use to change the fluid early on in it's life with genuine Enerpac hydraulic oil. Another point: Many manual and power operated hydraulics require fluid changes from the jaws of life to heavy equipment. My point is, if it benefits these hydraulic tools and equipment, why not a floor jack. My personal use floor jack will see moderate to heavy use in temperatures ranging from -10F to 100F. Since this is for personal use, I cannot justify spending $900 on a 2 ton floor jack, so it will probably be an import.