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I've never posted here before this thread. Do you care to explain the difference between the winter rating and the second number? My own understanding is rather oversimplified. I believe the first number to be to cold flow viscosity and the latter number to be the viscosity when the oil is hot...

I have an older Buick 215 with 150k miles. It's the V8 version of the ubiquitous 3800 V6. Traditionally, it would have called for 10W-40 or 10W-30 in my climate, but I've been using 5W-30 for better lubrication when starting it in the winter. It's parked outside and while it's rarely below 0...