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+1 for what lowmileage said. You want to avoid too much of a spread, so I'd stay away from 5W-50 for sure. I've used the Rotella 15W-40 and Mobil 1 15w-50, which has better ZDDP levels than some of their other blends although people still debate whether it's "good enough" for older engines.
Interestingly, I read someone comparing the "spread" in various oils by dividing (50/5-10, 40/15=2.67, 50/15=3.33). Regardless, the less the spread the better. My only other experience is that with very low "cold" numbers (0W-40, 5W-50) I've gotten some nervously-loud valve train noise on older cars until they warm up. So I don't go any lower than I need to for expected temperatures.
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Roger
1981 Alfa Spider, red
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