Say you live in the PNW and your air temps have a limited winter range (20 degrees F. to 45 degrees F ) for suburban driving conditions. For a Kia Seltos 2.0L non - turbo MPI engine - do you just stay with a D1/Gen 3 5W30 or drop down to the same in a 5W20 (or even a 0W20 ?) for 6 months / 4K mile OCI ?
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