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Originally Posted by JCL
That may just be a coincidence. The freezing is more likely caused by condensation (too many short trips) and by a plugged vent line, than by the oil viscosity.
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It is freezing condensation in the line or breather, no question. My travel pattern did not change over 6 years so I'm starting to believe the dealer was correct in prescribing 0W-40. I'm not sure why this makes a difference but I'm hoping for a 4th problem-free winter.