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.
Advances in oil chemistry and engine technology and an increased use of synthetic oil have lengthened oil change intervals significantly. For 2013 models, autumakers advise drivers to change their oil every 7,500, 10,000, or even 15,000 miles. The shortest oil change interval is 5,000 miles but only in some Hyundai and Kia models. However, the car service industry continues to tell customers that they need to change their oil twice as often.