The yellow-handled knife on the left side of this photo is the one that I carried when I was a mechanic. I started working in my father's garage when I was 15 and I received some of his handed down knives, mainly this one that had the tip broken off of the main blade. I squared it up a little bit and it made a good screwdriver. I also would sharpen the blade with a bench grinder and it worked well for cutting hoses and belts. The best part of this knife was that I always had it in my pocket. Many times we would be working on a car in the lot in front of our building and having the knife in my pocket saved me a trip back into the shop to get a screwdriver. Nobody had ever thought of multitools back then but I've since wondered how much use I could have gotten from a good multitool. I'm not sure what qualities I would think would be good from a pure knife for a mechanic but I seemed to cut belts, hoses and cardboard more than I cut anything else. This might be a good use for a fully serrated blade. Come to think of it, my Leatherman Charge ALX has a fully serrated blade, as well as a plain edge blade.