Pete it's a easy one.... stop driving like a tw@t on public roads!
Jason, I have a thermostat in my sandwich plate so it won't come on till 80C. Since having mine fitted the oil temp as never gone over 110C.... before I was seeing 140C
which then I would back right off on that lap, the oil was then changed after every trackday I did!
All jokes aside Pete 104C is nothing, the best running temp for oil is around 90C so that is nothing to worry about! One thing to worry about is the low temps some of you are getting because cooler oil is just as bad as the oil getting too hot!
Like I said I still get temps up to 110C on a summers trackday and thats with a 16 row cooler! But them temps are still safe