Useful life

{
  "id": "MLC-T-ENV-029399",
  "term": "Useful life",
  "field": "Environment",
  "term_source": "Useful Life",
  "definition": "The period of time during which an emission standard applies to vehicles or engines. For light-duty vehicles, and for light-duty trucks not subject to the Tier 0 standards built since 1994 model year, the useful life is 10 years or 100,000 miles whichever occurs first. For light-duty trucks subject to the Tier 0 standard is 11 years or 120,000 miles whichever occurs first. Heavy-duty motor vehicle engines and nonroad engines have varying periods of useful life as defined by EPA regulations.",
  "subject": "Air",
  "references": [
    "Importing Vehicles and Engines Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/useful-life/"
}