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Stricter environmental regulation of used oils and fluids requires that extensive testing be done before recycling or disposal. Heavy metals, chlorinated solvents and PCBs are the primary analytes of concern. A variety of analytical methods exist, ranging from complicated laboratory analyses such as gas chromatography/mass spectroscopy to simpler field methods that provide fast, qualitative results. Depending on the type of fluid being tested and the method of disposal or recycling for the fluid in question, the cost of testing can run from five dollars per sample to several thousand dollars per sample. Knowledge of available testing techniques can significantly lower the cost of complying with these complicated regulations. Waste lubricating oil is a valuable resource that can return much of its value when re-refined for reuse or when burned for energy recovery.