Arizona's summer heat is classified as severe in this region, and it does more damage to garage door openers than most homeowners expect. The motor housing on a chain-drive unit installed when this house was built has been running through 20-plus summers of attic-adjacent heat, and the capacitor and drive gear are usually the first parts to go quiet - not with a bang, just a slow refusal to lift on the first try, then the second. On houses built right around 1990, we also see original openers with no rolling-code security and no battery backup, both standard on anything sold today.
The other local failure point is weight. If a homeowner has swapped a lightweight original door for an insulated one somewhere along the way - common once energy costs became a bigger concern - the old opener is often still doing the lifting. It wasn't sized for the new door's weight, and it shows: slow starts, a motor that runs hot, a chain that jumps sprocket teeth under load. That's a mismatch problem, not a broken-part problem, and no amount of oil fixes it.