I have a 2006 Honda Accord with 140k miles on it. I drive approximately 15k miles per year and would love to see this car last me another 4-5 years.
I go in for an oil change every 3-4 months. Is this the appropriate frequency? Also, I've been using conventional oil but they recommend using a synthetic ($40 more) or a synthetic blend ($20 more). Will the "upgraded" oil impact my car's longevity? What are the pros and cons of upgrading the oil used?