Since the 1950s, the popular calculation of how old a dog was âin human yearsâ has been that 1 dog year is the equivalent of 7 human ones. Even though this formula has been around for a surprisingly long time, the reality is not so cut-and-dried. That doesnât stop many people from defaulting to this traditional calculation.
Oil Changes. I have a 2006 Hyundai Sonata with 56,000 miles on it. The owners manual says to change the oil every 7500 miles. The place I take the car to for the oil change says every 3000 miles. Friends of mine say every 3000 miles because it is mainly driven in the city.
A 4-cylinder 2009 Hyundai Accent has its first recommended spark plug change at 30,000 miles for both normal and severe conditions. Likewise, a 4-cylinder 1990 Honda Accord recommends a plug change every 30,000 miles or two years. âLong-Lifeâ Plugs Several manufacturers advertise âlong lifeâ spark plugs. Using precious metals such as silver, platinum, gold and iridium, these plugs have an advertised life close to 100,000 miles.