The Benifits of a Radiator Overflow Tank on a Vintage System

When was the last time you topped up your radiator, today, yesterday, last week?

I honestly cant remember, but I must make a note next time I do it.

I estimate it would be about 4 to 6 months ago, and I have driven well over 500 miles since, at speeds of up to 45 mph.

Been using the same system for well over 20 years.