^^^Hey dude^^^ keep us all informed when you figure out how to evade the sources of friction in mobile powerplant designs. I for one, won't be holding my breath.

Even "IF" a powerplant design were brought to fruition that had no moving parts (pretty unimaginable) there's still the need to transmit the output to something that will propel our "transportation device". Again, only "IF" in doing so you can eliminate all sources of friction can you similarly eliminate the need for lubrication.

Let's take a quantum leap and say a type of transportation is invented that somehow harvests antigravitation principles so we now have a device that floats above the ground. Unless you're satisfied with having a levitation device that essentially would go nowhere, you still have to exert some source of force on it to propel it in the direction you want to move towards. Again, unless in doing so you can also eliminate all sources of friction ... you'll still need lubrication.

BTW, I ain't even gonna drag my wrenches outta the ol toolbox for el-cheapo priced oil changes. Fuck that, it's why we have all those wanna be mechs workin for just above minimum wage at the oil change joints