M1 TDT 5w40 - What 1qt to add to it?

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This is going in a 3.6L V6 Ford engine with 130k miles on it. Driven daily through steep and windy mountain conditions on highway and side roads. Going to fill the sump with a gallon of M1 TDT 5w40 but need an additional quart to make up the rest. From my stash below what would you use? M1 AP 0w20, 5w20, 5w30 M1 EP 10w30 M1 0w30 Owner's Manual calls for 5w20 and 7.5k OCI's. Obviously I don't follow that. Thanks in advance!
 
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