Product review (4 stars): Same as Factory Original
The oven door started groaning on my late 1990's era Whirlpool gas slide-in range.

Cause:  left door hinge.  I replaced it only to find a week later the right door hinge did the same thing.  They are spring loaded and constructed of steel EXCEPT for on plastic roller piece that breaks.

The repair is an easy do-it-yourself.  A screwdriver and a pair of pliers is all you need.  I found a video online that was helpful in showing the repair.