On Monday, November 21, 2011 8:11:45 PM UTC-8, Eli the Bearded wrote:
Last week the garage door torsion spring snapped.
....the installer...
recommended oiling the spring with WD-40 every three months.

Why fiddle with it every three months? Paint it, or wipe on
boiled linseed oil. WD-40 is a better cleaner than protector.