I see some confusion between oil level and pressure.
If you oil pressure is dropping while driving (understandable in this weather) but the oil level is not significantly dropping then it sounds like an oil temperature problem or occcurrence. The oil dipstick is the last word on consumption rates. You would have to loose a lot of oil (less than 3 qts in crankcase) to cause a loss of oil pressure due to a leak.
If you see foaming on the dipstick, try using a different oil.
Don't forget to monitor the oil temperature gauge.
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