Rotating an inline-six by hand to show how smooth and well balanced these engines are... Something tells me not everyone will appreciate this, but for you engineering types, this is the beauty of an inline-six. I personally love how the pistons are like a wave emitting from the center, like throwing a stone into the middle of a still pond... Engine in question: 1986 BMW 325e M20B27 310,000+ miles on the engine However, I suspect it has been rebuilt once, but I don't have the records... you can still see honing marks in the cylinders. I've driven it for 60,000 miles up to this point. Oh, also the song playing in the background is Fischerspooner - Never Win. Daft Punk - Digital Love is coming in when the video ends. Just thought since the music is so prominent someone might be curious...