The best replacement for 20w-50 is 10w-40.

The best alternatives to 20w-50 are rated as following:
★★★★★  10w-40
★★★★★  10w-30
★★★★  15w-40
★★★  20w-40
★★★  15w-50
★  5w-40
★  10w-40 motorcycle
★  5w-30

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Google Trends

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20w-50
10w-40
10w-30