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It is known that the oxidation decay of oil in power transformer deteriorates the paper insulation of windings. To avoid the formation of incipient electrical failures, service providers recommend timely reclamation of liquid insulation. Even though the purity of oil is improved, the decay products previously adsorbed by the paper cannot be removed. Another setback is the unknown gassing tendency of reclaimed oil. This contribution shows that not only the reclamation improves the gassing tendency of oil, but also the type of Fuller's Earth affects this important property. By upgrading the analytical chemistry of oil the predictive maintenance of this non-renewable resource is modernized, its cost diminished and the service reliability of transformers enhanced.