The "Light" comes from the speed that light travels 186.282.4 miles per second so a light year is the distance light travels in a year which is 5.88 trillion miles i think hope this helps.
sounds like bad break light switch. your break pedal has a switch that turns on your break lights when you press on your breaks and off when you take your foot off the pedal.
Low oil pressure at idle. Change to a different brand filter and if the problem persists seek professional help before you do some serious engine damage.