What engine, mileage and conditions, though? The FBHVC tests of various
protective additives, compared to no additive, were done on an A-series engine
(said to be the worst for recession) at a constant full load for many hours.
It was interesting to note that some additives gave no change, others made the
recession worse! The FBHVC did not publish the names of these, only four
products that gave varying amounts of protection.
----- Original Message -----
As to the lead hysteria, I did a years long test for Shell using lead
free petrol on a newly built engine. When examined at the end of the
year there was absolutely no sign of trouble.
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