Posted by Tom Fleming on December 13, 2008 at 17:04:14 from (209.195.155.84):
In Reply to: Farmall F-20 Spark Plugs posted by Andy Motteberg on December 12, 2008 at 22:24:32:
Andy, go with the W-18's unless you are burning a bit of oil, then go with the W-20's. The hotter W-20 will burn the electrode faster if used heavily under load, which will change the gap, and eventually fail. However, if you have leaky valve guides, or worn rings, they are the ticket for good ignition.
Quite frankly, I have used both Autolite and Champion without any noticable difference. But to be clear, the only work my old girls get is an occasional antique tractor pull, or pulling logs out of the woods.
However, as with any product, then can be a bad batch, or design flaws that are corrected in later production runs.
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