I interpreted OP comment to mean his winter tires were 2 or 3 years old. If OP means he/she has only 2 winter tires, then, I agree, must be four winters. To do otherwise creates imbalance in handling and steering in winter conditions.
Speaking of which, I see Cochrane and AB generally, has some winter snow this morning. Too darn early.
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2018 340i xDrive M Perf Edtn Sunset Orange
Previous BMWs - 19 others since 1971.
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