i tried to get bosch h9dc plugs at autozone and all they had was this




butttt it says R on it, so reading the 'dont use resistor plugs thing' It seems i shouldnt use these?


can someone give me a NGK (alleged to work better) plug number for 89 300e m103 engine, preferably one I dont have to order online.


the current plugs are bosch 'super' copper ones (green line on plug)