I have the 175 D5 in a 2wd xc70.
I found having the polestar upgrade made a good tow car sublime.
In 4 years and 32,000 miles I have had 2 sensors fail, inlet pressure sensor and one of the exhaust pressure sensors, both at the same time and a bill for £420 at the dealer. I did have rear trailing arm bushes renewed at about 40k, this seems to be a regular job unless the modified Volvo bushes are fitted, mine were the modified ones and so far no problems. That apart it's been service items only.
The polestar gives you a little more power but a lot more torque, especially in the mid range, overtaking and towing where you are mainly in the mid range becomes effortless with it. You could live without it as it's not cheap but once you have it you'll wonder why you did without.
Paul.
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