When all else fails read the instructions. (owners manual for the suggested type of plug)
Also if the engine is electronic ignition I use resistor type spark plugs to reduce chance of electronic ign module failures.
Sometimes spark plugs get blamed for issues that are not really the spark plugs fault. (other problems show up later after running a new subbed plug for awhile it will fail and we don't ever hear the guy admit to these type failures)
Also if the engine is electronic ignition I use resistor type spark plugs to reduce chance of electronic ign module failures.
Sometimes spark plugs get blamed for issues that are not really the spark plugs fault. (other problems show up later after running a new subbed plug for awhile it will fail and we don't ever hear the guy admit to these type failures)