The best replacement for 5w20 is 10w30.

The best alternatives to 5w20 are rated as following:
★★★★★  10w30
★★★★  5w30
★★★★  5w30 oil
★★★★  0w20
★★★  5w40
★★★  5w30 motor oil
★★  10w40
★★  10w20
★  0w30
★  0w40
★  5w30 synthetic
★  20w50
★  0w20 honda
  5w30 synthetic oil
  5w30 difference
  5w50
  10w30 oil
  5w30 engine oil

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Speaking about 5w20, one probably shouldn't forget about 10w30.

Other search terms related to 5w20 and their ratings are:
★★★★★ 10w30
★★ 5w30
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