Personally I torque them the same way as the old 12v 40nm, 60nm, 80nm and then a re torque after it went through a normal heat cycle till the fan came in and went of.
I never had a problem with one of my 24v motors done like this.
The degrees are normally used on stretch bolts and the studs in the v6 are not stretch studs to my knowledge, other wise you would have to change them and you do not.
20nm + 40nm + 90deg + 90deg + 90deg end up in the region of 140nm (according to tests I did).
Considering that the material of the studs, block, heads and gaskets basically stayed the same I can not see why this changed (without the addition of stretch bolts).
Advantage of the degrees is that you do not have to re torque but the disadvantage is that on an older motor you will strip the studs out of the block.
My thoughts around this for what its worth.
I suppose I am old-fashioned.
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