What is the Guinness World record for most miles (kms) traveled by a single car in its lifetime?

Irving currently holds the Guinness World Record for the highest vehicle mileage on a personal car, with over 3,000,000 miles on his 1966 Volvo 1800S! Irving estimates he drives over 100,000 miles per year visiting car shows, with the longest stretch in one trip being New York to Vancouver, Canada. He was interviewed by Popular Mechanics after setting the world record and detailed the maintenance of his vehicle, saying that he changes the oil every 3,000 - 3,500 miles and changes the transmission fluid every 25,000 miles.

An even crazier feat was the fact that his original clutch (yes, this is a manual transmission vehicle) lasted a whopping 450,000 miles! (For reference the average lifespan of a clutch is around 50,000 miles with some people seeing 100,000 miles if properly taken care of.) Could it be that Volvo built a near-indestructible vehicle in 1966 or is Irving just that gentle on his cars? The truth probably lies somewhere in the middle. Either way this is a remarkable feat.