Engine oil shortage

All engines consume some amount of oil. In general it's considered normal to loose up to a quart per 1000 miles, but some use much much less and some a little more. Turbo chargers will also leak some amount of oil in normal use and when old and worn can leak more. This oil can be found in the intake tract downstream of the turbo and sometimes puddled right at it's intake. I don't know what the norm is for yours, google search 'normal oil consumption' for your car with your engine and see how it compares to others.

How many miles on it? How much oil was it low after the 1000 miles? Oil changed every 3-5K miles? Visual inspection shows no evidence of external leaks?