S70's use a very specific plug, and when i put in new ones this summer i almost installed the wrong ones, but took it to my guy to make sure it was done correctly. i bought the one i was told to buy at AutoZone, so possibly Pep Boys has the same kind of list. Check and make sure that the new plugs have THREE prongs. Bosch make four types of single-prong plugs that AutoZone (so maybe likewise Pep Boys) says will work in an S70, but my guy tells me they have to be a super specific three-prong Bosch.
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