The best replacement for 5w 30 oil is 5w 20.

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

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

Other search terms related to 5w 30 oil and their ratings are:
★★★★★ 10w 30
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5w 30 oil
5w 20
10w 30