I'd concurr with John; the Denso Iridiums are excellent plugs and last a long time as are the NGK V-series ones.
Regarding Bosch single-electrode Platinums; I've see two engines now where the platinum tip became dislodged and caught between the valve and valve seat. This caused a 25% leak in that cylinder and required new valves in those engines. I won't put them in anything,......
