It depends what type of quality oil and filter is in your vehicle. Most places use cheap oils and filters which only go 3,000 miles. With 100% Synthetic oil AMSOIL you can go 25,000 miles on the same oil and filter as well as getting a 6% savings in fuel.

Depends on many factors.. standard driving using conventional oil about every 3-4k miles synthetic oil some claim as high as 10k or more but 8-10 I think would be my limit.

Every 4 to 6k miles, under normal driving conditions. Anything more often would be overkill.

Here in the uk we change the oil every 10.000 miles or every 12 months which ever comes first .

Which oil?

Engine?

Transmission?

Power steering?