My switch to mobil1EP 0w20 and yearly oci

Thanks BornSlippy, I will try and track the deals on oil but Mobil1 EP 0W20 is advertised as 25000 Kms. Do the short winter trips makes the oil really that bad to change it @6000 Kms? I can take the car for a spin of few hundreds kms to evaporate any moisture ( I hope it already does that now +35 Deg C stop and go crazy city driving once a week). Is it Acids that kill the oil? I will be adding a liter anyways.
 
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