Myth about changing oil every 3k miles

Please give the make model and year, and how far do you drive it on these outings?

try using a quality fuel injector cleaner as the problem may be bad injector operation
if the engine was washed at the inspection , could be water in harness connection or shorting out electronic components
have the fault codes read to check for problem sensors before you panic and waste money

Every 3000-5000 miles.

Most import vehicle manufactures recommend changing oil at 5-7 thousand miles.When you have a wide range of temp as in the Northern United States, you need to have the oil changed 3-5 thousand miles. The reason is that the oil collects condensation after it has been up to operating temps, and shut off. There is some test that are being checked as to if the hot and humid temps have the same effect as in the winter months. I believe, it should be changed every 3 months and 3 thousand miles, which ever occurs first. I have used Synthetic oil in all of my vehicles, both cars and SUV's and change them at 5,000 miles. One of my Explorer's has passed 500,000 miles and the other one has 268,000. My cars also have Syn oil, is over 232,000 and no Mechanical problems in any of them. I hope this helps you with your question. Craig

I'm guessing they mean the cooling system. It is a good idea with any engine to have it flushed periodically. Permanent antifreeze is not permanent. It needs to be repaced regularly and it is a good idea to flush the system to clean out loose gunk when you do this. Unless Jaguar says NOT to do it, it should be done especially if it has never been done on your car. Hope this helps.