SM Spark Plugs

Hey guys! Couple weeks ago I asked about my SM having a miss, one spark plug is wet with oil. Has D18Y plugs in it now so was recommended to try D21 or Champion equivalents. My question is, do I run the D21s in all cylinders or just the one? Thanks!
 
I would just put it in the cylinder that is giving you the trouble. I ran D23 Champions in my SMTA at first, they have a long base and don't seem to foul as easily. Later on one of my regular plugs fouled and I didn't have a new on on hand so put the D23 back in and kinda forgot it. You can also get an extension to go under the plug that may help.
 

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