I can get the support bar to sit on the steel part of the chassis that runs through the engine bay to the radiator area, I would never put the bar on plastic or headlight parts, its on the metal beam where the grounding connection is and IIRC one or two of the feet sit on the ribbed/stamped section of the steel that sticks up like a spine. It works for me but takes some fiddling. I would have no issues leaving it like that for a long time. Also, M57 is only 440lbs or something like that so it's not some heavy beast, its more or less the same weight as BMWs other FI i-6 engines (my N54 is 400lbs).