Tired of changing your oil without really knowing if it needs it? Worried your truck might have a bad head gasket? Here's a high-tech yet simple way to be sure. The IntelliStick, which replaces the stock dipstick, electronically monitors the oil real time, 24/7, also scanning to make sure no coolant or fuel has mixed in. It performs laboratory-grade oil analysis, works with gas or diesel engines, and its results can be read on a smart phone, PDA, or laptop.