Sea foam oil viscosity

07 outback 2.5 non-turbo ~ 110,000
So I recently added sea foam motor treatment
into fuel tank @ probably 1.2 oz/Gal, burned
maybe 1 or 2 gallons of that fuel.
Today I flushed & changed my oil and
accidentally used 5w20 instead of MNFR
recommended 5w30 Moderate outside
temp(no Death Valley road trips); my question
is “will the sea foam fuel treatment further
reduce the oil viscosity? And if so by how
much?”   If that is the case I’d probably add a
thickening agent to the oil to try and combat
the thinning, or would it be better to just drain
and replace with the 5w30