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Sei por que o filtro de óleo está sujo.

Sei por que o filtro de óleo está sujo.
I know why the oil filter is dirty.
From Lesson 56:Taking a car in for routine maintenance·Hardcore Portuguese (Brazil)

Breakdown of Sei por que o filtro de óleo está sujo.

estar
to be
por que
why
sujo
dirty
saber
to know
o filtro de óleo
the oil filter
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