RN5 is what I always used, aside from experiments with NGK. They had the
nice tan colour one wants. Fuel in CT is 10% alcohol, and the engine ran very
nicely.
BPR6 is approx the same heat range, also used in MGBs.
Either should work well for you. Just judge by the colour.
Bob
> On Apr 15, 2019, at 8:49 PM, Richard Lindsay <richardolindsay@gmail.com>
> wrote:
>
> 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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