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.
You can check on the bottle to see how many miles the oil you use is rated for, but most synthetic oils will be fine driving up to 7,500 miles without a change. Keep in mind that many oil manufacturers tend to underestimate how long their oil will last in order to keep you coming back for refills more often. Because of this it is generally safe to drive one to two thousand miles more on your engine oil than the bottle advertises.