A tank has let's say 15 litres at least (pessimistic), and a capful is about 15 ml (pessimistic) so that would change the mixture by less than 0.1%, but probably closer to 0.05% (above estimates pessimistic). Is this significant??
I was given this advice by veteran NSR racers here (after failing to persuade me to remove the oil injector completely).
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-