Some clarification: I have an external HDD that gets it power from the USB port. Even if I turn of the computer, the HDD won't shut down, because there's power-off charging on that port. This is my only USB3 port, so using an other port is not an option.
Mobil 1 Extended Performance synthetic oil is recommended for oil change intervals up to 15,000 miles or one year, whichever occurs first. However, if your vehicle manufacturer recommends an oil change interval beyond 15,000 miles and Mobil 1 Extended Performance meets the performance level specified, you can be assured that Mobil 1 Extended Performance will go the distance.
If you are using a quality motor oil, changing it at 3-4000 miles is a waste of money. That is, of course is dependant upon the items mentioned above. A synthetic fluid should be good for 10K easily, providing the items mentioned above are good. The key is Filtration, Filtration, Filtration