[sugarwood]

Oil change. Jack the rear.

I used the side plate to jack up one side
Placed jack stand under the torsion bar end.
Jacked up the other side plate
Placed jack stand under the torsion bar end.

Changed the oil. 15mm. 30 ft/lbs. 10 qts.

Time to lower the car to the ground
Raised passenger side and removed the jack stand
Lowered passenger side to the ground

After a few seconds the driver's side slipped off the jack stand.
Luckily, jack stand was just sitting freely in the large cavity near torsion bar end.
Jacked up the driver's side and removed the jack stand.

This has never happened before. Maybe I jacked it a bit higher than normal ?
Next time I will closely eyeball the jack stand saddle and make sure there is a lot of torsion bar protrusion onto the saddle.

Normally, I jack the rear from the engine, and place/remove both jackstands at once, but I forgot about that method this time.
That is a more stable method.