homick Hi, has anyone tried the new NGK Ruthenium spark plugs for the z22se? Link shown below. Do you think they will be ok to put in? Seem like they have a fairly long life and better fuel economy. https://ngksparkplugs.com/en/products/ignition-parts/spark-plugs/ruthenium-spark-plugs
KevinH My Vectra B has the GM triple electrode plugs (9199038) and is on it's fourth set at 124K miles.