I say use what works best for you. On light use tractors I got tired of buying D21 champion plugs years ago that would start missing on one cylinder in a short use time. Put autolite in the same tractors with very little problem.
Bought a SH tractor a couple months ago that just had D18Y champions installed. Long time since I had used champions so thought give them a try. Week two it was missing so autolites went in.
Forgot I have champion in gas start diesel doing okay but they are old stock. also have AC plugs in one tractor that have lasted longer than the chapion for me. As they say your results may differ.
This post was edited by D Slater at 18:55:45 11/15/11.
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