Two liters per 5000 KM is about a quart every 1600 miles - not bad. It slips past the rings and valve guides. All engines have to consume some oil to lubricate the upper rings and valve guides, then is is consumed in combustion. Consider that in 1600 miles your car consumes about 80 gallons of gasoline, so one quart in 80 gallons is one part of oil per 320 parts of gasoline - an insignficant amount.

Up until I refreshed the cylinder head in my Cosworth Vega is consumed a quart every 200, but could pass the emission standards for a modern car.

The lowest oil consumption I have ever experienced in my 103 is a quart every 2000 even after the newest design valve guide seals were installed and, emssionwise, it has always been a lot dirtier than the CV.

Your emission numbers are very good. Many 103s are on the ragged edge of the HC limit.

BTW the 0.1% is CO not CO2.

Duke