Apply excessive torque can not only break parts, but for things like oil drain plugs, filter housings (for carswith elements instead of screw on filters) spark plugs (thats a big one) and basically every other engine, trans and suspension piece i torque to spec. Oil drain plugs and such ive basically got a feel for since ive been doing this for so long, but when it comes to motors and transmissions I use the snap on tq wrench no ifs ands or buts.