5 years or 50,000 miles is now a commonly accepted compromise.
In the 80s and 90s Fiat would recommend 36K miles or 3 years. In the
2000's 72K miles became a common manufacturer recommendation but some
makes of cars failed to get to that sort of mileage and the
manufacturers started to back off the mileage and time recommendations.
Back in the 80/90s spark plugs would have been replaced every 6,000 and
then 10,000 miles. Now some only change them at up to 100K miles.
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