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A natural gas engine oil must be designed and balanced in a proper way in order to be able to offer: excellent deposit control, superior oxidation and nitration control, extenden lubricant filter and engine life and reduced frecuency of shutdowns for main tenance. In order to choose a correct formulation, it was decidet to run a field tests where five differents low ash additive packages were tested. The selected engines are five WAUKESHA, model H2475, they are rated at 300 HP and are used for water pumping. The five engines were rebuilt before the beguining of the test. The liner diameters were measured, the same as the ring gaps. At the end of the test, that lasted 10.500 hs., the measurements were repeated and pistons and cranckases were inspected and calificated for deposit formation. Each 700 hours, a lubricant sample was analyzed for its main characteristics in order to evaluate its performance.

Modern engines demand better perfomance from the lubricant. In order to fulfill them it is necessary to add the base oil some products that are called “additives”. Between them the Zinc Dialquilditiophosphate family is worldwide used, and there has not been other product better than this as antioxidant-antiwear-anticorrosive. Such perfomance is very closely related to its thermic stability and chemical structure. Our Research and Development group began to work in a six stages project which covered the deep action mechanism's analysis to a manufacture agreement with a private company. At industrial scale it has been got a product which has been tested not only by standar determinations but also in bench, engine and fleet tests, As a result we got not only a competitive product both in price and quality, but also the growth of local suppliers of critical components to the petroleum industry.