Others have tried to fix a skewed garage door by only
greasing the rails. Inspection is required to first determine
if those two springs are properly balanced. If the springs
are not balanced, then the door will (obviously) skew within
the tracks and make more noise.

Oiling bearings will trap dirt just like grease. Getting
grease on ball bearings is not as easy as applying oil. But
then there is good reason why ball bearings (especially on the
wheel high above the dirt that supports a 90 degree cable
turn) are so often greased - not just oiled.

Richard J Kinch wrote:
w_tom writes:
Also balancing the counterweight springs so that the door
does not 'skew' will help.

A skewed door is not caused by any imbalance, nor corrected by "balancing".

Be careful. Those springs can contain a surprisingly large
amount of force. ...