Steve-
When the I5 motors first came out, they used a copper core plug with one ground electrode. Turbo or no, same plug. Then they had some issues with the non-turbo cars fouling the plugs on a cold start. The solution was a multi-electrode plug. At the same time, they went to a 'dual-platinum' plug for the turbo engines. Volvo now has two distinct spark plugs for the 'white motor', depending on whether it is turbo or normally aspirated. Same plug for 4/5/6 cylinders respectively. The correct plug is the one the manufacturer specifies.
Dave the Volvo Tech
'99 V70R AWD, '93 854 GLT, '82 242 DL
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