So I'm sure most of you are aware that our cars are designed to use non-resistor copper spark plugs. For the last 7 years I had been running the Bosch HR9DC0 which are resistor plugs. (mainly because AutohausAZ had them for $1.50)
My car has it's upcoming biennial emissions test and I always like to change plugs and oil before the test. This time I decided to order a set of NGK BP5EFS from the UK. These are slightly hotter plugs than stock, I'm using them to help keep emissions down as the M103 puts out more emissions when cold.
I paid $2.93 per plug plus around $6-7 for shipping. For some reason NGK US won't list the non resistor plugs on their site.
I tell you what a difference the non resistor plugs make! Before I had a bit of hesistation when accelerating and the engine didn't have the smooth power that the M103 is known for. With the new non resistor plugs acceleration has smoothed out, throttle response has improved and the motor pulls hard when kickdown is engaged. So do your W201 a favor and install some non resistor plugs if you haven't already done so!
My car has it's upcoming biennial emissions test and I always like to change plugs and oil before the test. This time I decided to order a set of NGK BP5EFS from the UK. These are slightly hotter plugs than stock, I'm using them to help keep emissions down as the M103 puts out more emissions when cold.
I paid $2.93 per plug plus around $6-7 for shipping. For some reason NGK US won't list the non resistor plugs on their site.
I tell you what a difference the non resistor plugs make! Before I had a bit of hesistation when accelerating and the engine didn't have the smooth power that the M103 is known for. With the new non resistor plugs acceleration has smoothed out, throttle response has improved and the motor pulls hard when kickdown is engaged. So do your W201 a favor and install some non resistor plugs if you haven't already done so!