FWIW the same man spoke on thermostats and fuel additives and said. additives
on old style 'soft' cast iron or chilled cast iron valve seats may be required
and will certainly benefit seat life. But excessive additive may drop out of
the fuel suspension and form a coating on the spark plug insulating porcelain
and result in potentially poor spark. This problem is worse when the user
adopts the principal ' more is better' and worse again if the correct cylinder
head temperature is not maintained causing greater cylinder head build up which
will release itself with a good dose of wide poen throttle and/or high temps.
which we all know about.
Joe
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