The best replacement for 5w30 is 10w30.

The best alternatives to 5w30 are rated as following:
★★★★★  10w30
★★★★★  5w20
★★★★★  5w40
★★★★  10w40
★★  0w40
★★  0w30
★  10w30 oil
★  0w20
★  5w40 oil
★  30w
★  5w20 oil
★  5w50
★  5w20 synthetic
★  15w40
★  sae 30
  20w50
  10w40 oil
  10w30 which is better
  10w30 motor oil
  5w20 honda
  5w20 motor oil
  5w40 engine oil
  5w40 synthetic oil
  10w30 synthetic
  royal purple 5w30
  15w50
  10w30 engine oil
  10w40 engine oil

Your alternative for 5w30 is not listed? Suggest!
Speaking about 5w30, one probably shouldn't forget about 10w30.

Other search terms related to 5w30 and their ratings are:
★★★★★ 10w30
★★★ 10w40
★★★ 5w40
★ 5w20
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5w30
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5w20