no problem with it. but don't take this as practice.

my oppinion is that we can change the oil in longer intervals. the 5K and 10K oil change is made up my mechanics and not the manufacturer. check for the manufacturer's guarantee...synthethic oils are guaranteed up to 40K km.

further more the 5k and 10k theory has been around since donno when ...and technology had improved so much over the years.

My oil is dark, should I change it?
This is a huge misconception that needs to be addressed. The fact that your oil is dark does not in any way mean your oil is ready for a change. A large percentage of the contaminants in your oil is 1 micron or smaller. Only particles 5 and up cause damage. The smaller ones are safely suspended in the oil. A diesel trucks oil turns black in the first few hours of operation, yet the oil is used for many thousands of miles. Only an oil analysis can tell you weather or not your oil is still good or if it needs to be changed. * It is important to note that this applies more to synthetic oil. I personally wouldn't run a petroleum oil over 3,000 miles or 3 months because of the breakdown properties.

Mobil 1 oils are likely to go 10,000 or 6 months though they make no mention as to how long it can really go, and I doubt there is much difference between their regular synthetic and there new extended drain oils they are marketing. Amsoil makes a 7,500 or 6 month oil, as well as a 25,000 or 1 year oil that is guaranteed.