My 2011 Mitsubishi Outlander 2.4 petrol has been taking oil 2 liters since last oil change... Last oil change was May 2020 (i have booked oil change September 2021) and since may 2020, I have added 2 liters of oil because oil level was low...
No blue smoke on start up nor blue smoke on idle.. High revs there smoke but it's not blue and it does not smell...

Mileage: 122 000 km

I have diagnostics time booked from dealer in two days and they will probably do a compression test. If compressions are ok, then what could be an issue here?
Aftermarket parts: Lancer Evo air filter and aftermarket exhaust muffler

Please help
Thank you!