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    Is 5W-20 to thin for my old Buick engine?

    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...
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