Ditto to all the replies. Oil changes are the absolute extension of life and life-blood of an engine. Why and how you have to add so much is a huge question. Have you EVER changed the oil? Once a year or 7-10K miles whichever comes first (the -10K is if there mostly long trips at speed, and such). Mine rarely went 4K so mine was once a year (mainly because I have to for the LPW (Lifetime Powertrain Warranty). Go change your oil and filter!