The best replacement for sae 40 is 15w40.

The best alternatives to sae 40 are rated as following:
★★★★★  15w40
★★★★  10w40
★★★★  sae 30
★★★  10w 40
★★★  20w50
★★★  sae 50

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sae 40
15w40
10w40