First - start checking it a few times a month
Second - switch of the m1 crap to a castrol or any other syn. Avoid M1 and royal purple
Third - log when the drop takes place. It will most likely be steady (bad rings, PVC problem etc) or drop off quickly after x miles (suggesting a thinning and burning)
However 1.6 qt in 4k isn't bad. Which is what I believe the car is low on when the low light comes on. No one will fix that low an oil consumption rate.
If all else fails you can try a 0-30 to see if thicker oil doesn't burn/consume as quickly. Last restore mind you.