I guess I could have qualified my answer a little. If your burning a qt. per thousand after break in, I'd be looking for where it went. If you change your
oil at 3500, then your doing about a 50% replacement per change. My 428 never used a bit of
oil at over 100k. My 7.3 PS uses about a qt between 3500 mi changes Both are in the 450hp range.