New answers tagged oil-change
1 quart every 3000 miles seems to be well within the spec for just about every Prius, so it seems almost certainly acceptable for yours ( though we still haven't heard what year yours is ).
Try the owner's manual. If that doesn't say, contact your Toyota service department and have them check the maintenance manuals. Different cars have different acceptable burn off/losses. For example, my Toyota MR2 is within specification as long as it doesn't burn more than 1 quart every 1000 miles.
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