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Discussion Starter #1
I have a D140.
At the dealer yesterday and he said he couldn't tell which plug I needed - it listed both. After a lot of research I know more about plugs and what the letters and numbers mean, but even after searching TractorForum AND John Deere, I don't know which plug is better.
It might be that the newer 100 series uses the hotter plug w/ greater resistance. I have the RC in the mower now and that is a safe bet, just use that (I brought both home), but still I wonder --

So, any thoughts?
Thanks!
 

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Discussion Starter #4
11 miles to the dealer; 14 to auto parts.
would like to know why the xc92 over the rc12; problems using the xc in the D140?
 

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I found this in a google search from snowblowers .com

From what I can find the two plugs have the same heat range so are interchangeable without any difference in mechanical engine performance. BUT if you have a fuel injected engine you should use the QC plug. It's internal electrical construction is different to work properly with fuel injection systems.
 
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