Will Sea Foam Motor Treatment reduce oil viscosity? [SOLVED]

My car is a 07 Subaru Outback 2.5 with 110,000 miles.
I recently added Sea Foam Motor Treatment into fuel tank at probably 1.2 oz/gal, burned maybe a gallon of that fuel.
Today I flushed & changed my oil and accidentally used 5w20 instead of MNFR recommended 5w30; 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. Recommendations?

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Jim D.
Jim D.
3 years ago

Thanks for the question Vaughn. Sea Foam in your fuel would not have any relationship to the oil in your crankcase. It seems your question has more to do with adding a lighter weight oil to your crankcase. If it were me, I’d just leave things be. For what it’s worth, the oil weight is equal, and going 20 in a 30 is  not a significant difference (and 20 will have better cold flow properties). If having the mistaken oil in the crankcase bothers you, get the oil changed.