I believe there is a strong correlation between being mechanically inclined and one's interest and success in medicine (this is not to say that you're not going to be successful if your not mechanically inclined). My mom loves to tell a story of when I was four, I totally disassembled my bicycle (to her horor) and then put it back together. Later, through high school and college, I owned two cars (VW GTI & VW Jetta) and two motorcycles (Kawaski ZX-7 & Suzuki GSR-750R). When I first owned the vehicles I bought the repair book and over the years I have done all of the maintenance and repair work myself. Where I believe the correlation comes into play is that all of these experiences have taught me, and sharpened my skills, in the context of diagnosis & treatment. I mean in order to fix your vehicle you first have to figure out what's wrong with it. This is actually the hardest part. To diagnosis you have to listen to the engine in detail, much like you would while taking a hx and vitals of a patient. You also have to be hangs-on, for example trying to determine where odd vibrations in the engine coming from, much like you would while palpating a patient. Also, as you are taught in osteopathic medicine, the immediate condition is many times related to another underlining one. You have to take the whole person approach. Finally, I am happy to say that all of my prognosis to date have been excellent!
In terms of Liquid_Tension's comments, I don't believe it is right to call anyone's questions "ridiculous". If so, how are you ever going to be a competent & compassionate physician? Finally, I think that this person is spank'n his monkey just a little too much ... just look at their log on name.