Sea foam oil viscosity

Asked by ThatMFvon Nov 17, 2019 at 12:41 PM about the 2007 Subaru Outback 2.5i Limited Wagon AWD

Question type: Maintenance & Repair

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

2 Answers

F_O_R answered 5 years ago

Unless your car has leaking fuel injectors I do not think the fuel treatment has any way of getting into the oil.

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TheSubaruGuruBoston answered 5 years ago

As needed just add a quart of 10w40 or even 20w50 to balance the viscosity. Stay away from 5w in the old 2.5 SOHC motor, or it'll seep through spark plug gaskets and rear main seals. 5w30 synth is ok if you have a tighter motor.

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