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Service life. My ship used MILSPEC 2190 TEP oil in everything, short of the Emergency Diesel Generators. In my 5 years on the Ship we changed the oil in the Main Reduction Gears 3 times, and none were due to wear caused by usage, all were due to water contamination due to improper steam seal alignment. In those 5 years the Ship covered over 125,000 Miles of open sea and never had oil issues other than the water contamination. The reduction gear sets on the Ship are so expensive (due to the manufacturing process) that the Navy doesn't even own them, they are leased from the manufacturer for the life of the ship, and returned to the company when the Ship is decommissioned. My Ship decommissioned at the end of March this year and I contacted the Gear Manufacturer inquiring as to the condition of the gears, they said they looked like they had been in use for about 5 years, and the Ship was in service for 32 Years.
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