The best replacement for 20w50 is 10w40.

The best alternatives to 20w50 are rated as following:
★★★★★  10w40
★★★★★  10w30
★★★★  15w40
★★★  5w30
★★★  15w50
★★  20w40
★★  5w20
★★  20w60
★★  10w50
★  sae 30
★  50w
★  sae 50
★  sae 40
★  30w
  5w50
  10w60
  aeroshell 15w50
  amsoil 20w50
  motorcycle oil
  sae50
  5w40
  mobil 1 20w50
  10w30 oil

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Speaking about 20w50, one probably shouldn't forget about 10w40.

Other search terms related to 20w50 and their ratings are:
★★★★★ 10w40
★★★ 10w30
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Google Trends

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20w50
10w40
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