hey guys i have a 1997 nissan sentra did and oil change today and barely a quart if oil came out. this is the second straight oil change this has happen. car has not run any different suprisingly no oil light on either. i did 2 rounds or arx and changed the pcv valve, and have been using 5w30/10w30 oils. been thinking of stepping up to a 40 wt. any ideas? thanks guys.