5W-30 and 5W-40 have the same cold or low end protection, but the 5W-40 has a higher temperature threshold than 5W-30. I just made that switch myself, so far no problems. I am using Motul Ester 5W-40.
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2017 Ford Focus RS Nitrous Blue "KB43VER"
2014 370z Mag Blk 6M "KOKURYU" (Black Dragon)
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