The best replacement for 5w-30 is 10w-30.

The best alternatives to 5w-30 are rated as following:
★★★★★  10w-30
★★★★  5w-40
★★★★  5w-20
★★  0w-40
★★  10w-40
★★  0w-30
★  0w-20
★  5w-50
★  sae 5w-30
  5w-20 oil
  20w-50

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Speaking about 5w-30, one probably shouldn't forget about 10w-30.

Other search terms related to 5w-30 and their ratings are:
★★★★★ 10w-30
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Google Trends

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5w-30
10w-30
5w-40