It may be noteworthy that I first declare my own prowess in the art of auto mechanics and engine maintenance - that being none whatsoever. Thus I started my journey through these grease-stained orange covers (evidently I picked up an older printing) still wet behind the ears, green at the gills, etc. I have emerged with a great deal of newly acquired knowledge nested in my brain. I think it would be equally useful to a seasoned pro that needs to look up a particular detail. The book provides detailed information on the various parts of the standard (int. comb. gasoline engine) automobile; starting with the fundamentals of a single-cylinder engine, working up from there, and eventually taking the reader through ignition, cooling, lubrication, fuel, exhaust, transmission, and electronic systems. This is a textbook (which explains the price), so it includes questions at the end of each chapter, which are helpful. Also, you should realize that picking up a book, even this one, will not be extremely useful if you don't have an old block or something to actually check out. Having said that, if you just desire a 'fundamental' understanding of auto mechanics, this is still a good bet (although you may want to pick it up at your library instead of buying it). Five stars!