I have used the orange Havoline antifreeze in other vehicles.
While it may be phosphate free, it seemed to work its way past every single
hose clamp on the car, leaving a dry orange ooze, which bugged me to no end.
I wont touch the stuff anymore.
On the other hand, if you are looking for a leak.........this stuff will show
it up and others besides.

Steve Cotsford