No I don’t do 3,750 , I do 3,500 mile / 6 month OCI’s in my 2.4L GDI . I’ve done 4K mile OCI’s before and the oil was getting dark and smelling pretty bad .Do you honestly do 3750 mile intervals or do you round it up to 4000? (which would be way easier to track and would not hurt it in any way)