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XP9 = 10W-40
DT40 = 5W-40
DT is the street car formula and XP is race. I assume the difference is in the friction additives and the XP9 costs more.
The Spec box never sees below freezing starts but it does see service above 4000 rpms for 30 minutes often.
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PCA Intermountain Region Track Chair
SPB #50
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