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Because plugs last 40-50K miles, or more, I have always justified using Volvo plugs. Your owner's manual has only one plug description:
Spark plugs: Champion RC8PYP 8 (or equivalent)
Spark plug gap: 0.028-0.032" (0.7-0.8 mm)
Tightening torque: 18.4 ft. lbs. (25 Nm)
No mention of a different plug for HPT, which seems wierd to me. The NA cars have always had different 3 prong plugs.
I suggest calling Volvo 1-800-63-VOLVO (1-800-638-6586)
and see if they have different specs for the R.
What ever you do, do not buy multi-prong iridium tipped plugs. They have a tendancy to loose a prong which can get stuck in an exhaust valve and break things.
Klaus
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Volvoless. Sold the R. There is now a void...
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