timing belt S60 2003 2.5T Timing Belt Questions

[FluePeak]

Hello!

its time to do the timing belt on my S60 2.5T and i have a bit of a confusion as i get different answers from everybody.

Let's begin like this; I know how the job is to be done but have questions regarding the VVT

As i understand the 2.5T has 2 VVTs unlike the other models only have 1, when doing the timing belt i have seen some use the Cam locking tool to ensure that the camshafts do not move and some do without.

I can link a video with this here where they use the tools and "zero" the vvts: https://www.youtube.com/watch?v=319G0Ohfelw&lc=UgxILbTqEz7NPsgaOEZ4AaABAg.ABit639GdQAABiwEEybwj9

And on other they zero the motor and remove the pullyes and tensioners and put the new pulleys on and belt without any locking tools or resetting the vvts.

Which you can find here: https://charm.li/Volvo/2003/S60 2.5T AWD L5-2.5L Turbo VIN 59 B5254T2/Repair and Diagnosis/Maintenance/Timing Belt/Service and Repair/Timing Belt%2C Replacing/

Some say that you need to zero the VVTS and thats why they use the cam locking tool.

In the original instructions it do no say anything about using said tool to do it.

It do says to find the marking and zero the motor. After that turn the motor 1/4 rotations clockwise and then counter clockwise untill the markings line up.

When doing the counter clockwise rotation the tensioner will untension itself to ensure the vvt do not move when you remove the belt.

All help is appreciated.