I just got an 2017 S60i T5 and was looking on the internet for how to do a drain of the fluid given that its supposed to be lifetime according to Volvo.

One author pointed out the following:

Remove the T40 Torx bolt. Approximately 1L of fluid escapes.

Next, remove the 17mm Hex. Approximately 2.5L of fluid escapes.

In this scenario since I dont have a picture I could see from the website image that the T40 torx bolt was bolted into the larger 17mm hex bolt. I have never seen that and dont know how it works? I would think that if any bolt was removed from the drain you would lose fluid? But according to the text I copied you dont. You then remove the 17mm Hex and more fluid comes out. Apparently the T40 is called a leveling bolt.

The refill procedure is fill the transmission with specified amount, start engine and run thru each gear for 2 second, repeat again and put transmission in P. Then remove the leveling bolt only and run engine until ATF is 50Celsius. Stop engine, switch ignition to OFF. Remove the leveling bolt, and fill transmission with 0.5 litre until ATF drips from level tube. I assume that means when the level bolt is removed it will drip at some point when you fill transmission fluid? After it starts to drip stop adding fluid and let it stop dripping then put back the level bolt. Note that the instructions didnt say remove the 17mm Hex.

Can anyone tell me from this write up how the 17mm Hex and T40 bolt work together to hold fluid in the drain hole and how the T40 torx works to level the fluid level given there is no longer a dip stick?