My fx45 is thirsty for oil.

2008 FX45 with 80k miles. Mine burns about a quart or so every 4000 mile oil change. It's stayed consistent over the years and I'm not worried.

 
You might want to try moving up one level in viscosity (i.e. from 5W-30 to 10W-30 or next level 10W-40) but stick with the 5W-30 for your long cold winters!
 
Wow, 3 liters in 2000km is high. That's like 3.5 quarts every 1200 miles. Don't some FX45's have issues with the piston rings?
 
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