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not sure on the s80....my v70 filter is located on top of the rear axle (right side), I can see it when I get my oil changed. To access it I had to remove the carpet and a plug from the inside, a pain in the rear and it still wasn't easy to change.....no way you could possibly get to it from underneath. I went to IPD (in Portland OR) and bought a Bosch replacemnt filter.....and whatever you do make sure you plug the holes from the old filter or else you'll end up with spilled gas inside your car......I'm thinking your S80 filter might be in the same area......good luck.
ee
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