In this case, can we use the present perfect and past simple interchangeably?
-I have read/ read this book six times and every time I loved it!
Thank you very much.
If you use the present perfect with 'read', you can also use it with 'love'.
If you use the past tense of 'read', then there is a slight suggestion to me that the last occasion was quite some time ago. I would expect the context/co-text to at least imply this - for example, if the speaker were talking, some time after graduating, about his time at university.