There are many instances of VmI MLLDs functioning 10 or more years. When our customers review critical component equipment such as MLLDs, it is important to remember the more cycles, wear, and exposure, the higher the probability of reduced function or imminent failure. VmI suggests each site have a preventative maintenance / risk reduction program that incorporates each site’s ecological sensitivity, historical information, equipment age, maintenance history and other operational risk management considerations. Our customers should consider a replacement schedule based on information provided to us by testers suggesting previous generations of our MLLDs have a 5 to 6 year mean time to failure in the field. Site specific conditions including particulates in the fuel, exposure to acids, water or other oxidizing agents in the fuel, and other site specific conditions may cause premature substandard performance or equipment failure. At this time, and until information to us changes, VmI recommends a maximum field service life of 5 years for all VmI MLLDs.