I have been watching this and waiting for some responses.
We had an overheating problem this spring.
Same situation, resevoir was empty.
I added a 50:50 mixture right off the shelf.
Still had an overheating problem.
Contacted my yard, and they said that I used the wrong stuff..???
They corrected it, and I have not had a problem since than.
Courtney is My Hero
If a man is to be obsessed by something, I suppose a boat is as good as anything, perhaps a bit better than most - E.B. White