[Mg-t] RN4C vs RN5C

[Richard Lindsay]

Hello Friends,
   If using Champion spark plugs in a '53 TD with 89 octane petrol at (up
to) 10% alcohol, is it advisable to use a slightly hotter plug (RN5C)
versus the recommended (RN4C) plug? I also have NGK BPR6EIX platinum plugs
in hand, in the correct heat range. Advice?

Rick
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