If it was already warmed up and still burned a bit of oil at idle but only when accelerating from a stop, I think that's piston rings leaking a little. If it's burning while under acceleration, I think that's valve seals. I may have them backwards...
In any case, there's a compression check in your future and either way, I don't think I'd worry that much about it as long as the oil is clean (no antifreeze/milky oil).
Maybe go up to a 40 weight oil?
Were you using synthetic oil the whole time?
Did it ever get hot to the point of overheating and perhaps score a piston wall?
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