The best replacement for 15w-40 is 5w-40.

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

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15w-40
5w-40
10w-40