My bad, the max oil consumption is in the Overhaul manual - but 1.05 qt (1 litre) an hour is out of spec - no brainer, the engine needs repaired.
SuperGuppy does raise a point, it is essential to track the oil used by the engine - any radical change in oil consumption indicates a problem. He is incorrect about the color of the oil - oil that quickly changes color after a change can indicate excessive blowby. Note that this is not an exclusive indicator of engine condition, but a factor to consider. Further, oil loss out of the breather is a great indicator of excess blowby and should be investigated.
If you really must fly this airplane, get a qualified mechanic to look over the engine (at your own cost if necessary) Get a second opinion if necessary. It's cheaper than a trip to the emergency room!