and all of this is why...even though my dealer gave "free" oil changes for 2 years.....on 2 cars i bought the same night......I do my own oil changes.
My wife thinks I am crazy, but i dont have the patience to explain to her the countless stories like this from the 35 years i have been a licensed driver.
I quit changing my own oil 32 years ago . Have never had a problem with it. Have saved countless hours and dirty fingernails and my time is worth significantly more than the mechanics cost to me .