Hi,
Buy yourself a set of Bosch Copper plugs. These are the ones that Volvo installed in the car. In 1999 model year some engines came off the line with Champion spark plugs. A good plug for the price but I would go with the Bosch.
I know I am going to tick off someone with the following statement but I am going to say it anyway. Stay away from the Platinum plugs! They will last longer without flowing but they will also slightly ruin your gas mileage. I have empirical evidence stating such.
Good Luck,
Steven---
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