The best replacement for 30w is 20w50.

The best alternatives to 30w are rated as following:
★★★★★  20w50
★★★★★  5w30
★★★★  sae 30
★★  10w30
★★  5-30w
★★  10w 30
★  10 30w
★  40w
  5-20w

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30w
20w50
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