The best replacement for 10w-40 is 10w-30.

The best alternatives to 10w-40 are rated as following:
★★★★★  10w-30
★★★  5w-30
★★★  20w-50
★★  15w-40
★★  20w-40
★★  5w-20
★★  10w-50
★  15w-50
★  0w-40
★  5w-40
  5w-50

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