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2 CONSIDERATIONS ON THE OIL ANAL YSIS The incrementation in the silicon values was due to some changes in the quality of the gas. Thanks to the synthetic solvency, high TBN number and the high film strength of the Quadrex oil the incrementation of the TAN even over 3 did not create any problems in the quality of the oil and helped to maintain the engine clean even after 4.2 hours in service (Test ended and oil was changed). Quadrex could have remained in service in the engine for even more than 4.5 hours. QUADREX HOURS IN SERVICESCOMMENTS ON OIL ANAL YSIS 2.5.9 2.8 all values OK, TAN slightly increased, TBN always more than double5 3.2 3.9all values OK silicon stable, TAN increased, but TBN always more than doubleall values OK, silicon increased to 6 ppmall values OK, silicon increased from 7 to 2 ppm all values OK, silicon increased to 7 ppm all values OK, TBN increased due to top off of new oil at roughly 3.4 hours APPLICATION: electric energy production in Biogas plant using gas derived from animal, vegetable and feeding waste. ENGINE TYPE: Jenbacher 3 detuned and limited , with total production per hour of 6 kW. The Engine has major overhaul every 3.0 . OIL IN USE: mono-grade mineral oil with an oil change interval every 1.6-1.8 . the engine uses roughly 7/8 lt for each oil change and top offs. TEST OIL: ROYAL PURPLE QUADREX 4HB (1TBN). TEST DESCRIPTION Together with the company Elmar, we decided to test Quadrex in Jenbacher 3 that was installed at Agricola Dalla Costa (the engine chosen for