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Many have experimented with this, but I got first hand experience of Castro TSW 10W60
I've been running pretty hot this summer, oil temp into 270's, ambient temp 90-100F
My original cocktail has been 50%M1 0W40, 50%Motul 15W50
I switch to 50%M1 0W40, 50% castro TSW 10W60
On the street, I've...