Went vaux today brought stuff needed for oil change. Stupidly dint check oil, which i thought to do bout thousand times anyway drained out old oil (5w 30) and then realised he's given me semi synthetic 10w 40. Im at work so have had to put it in to get home. I was gonna buy the right stuff tomo and re change it again as ive left the old filter on. Should i do this or will it be ok to leave. Last changed 5k miles ago.