My 5.7 hemi has just over 20,000 on it now, I've put just over 3700 on in since I got it, two years ago. I'll never change them. The full synthetic oil I've changed twice. My built engines from my last cars, I was changing and screwing with them all the time. I drove them all the time, the older I get the less I want to work on them. The reason for my choice when I bought my coronet.
