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i've always thought you used 30w on the 1st start up and 20min break in. 
With the lack of zddp (zinc)in today's oils, it is not wise with the new flat tappet performance cams out on the market. You need to use some kind of a break in lube that adds those addititives, such as GM EOS, COMP cams break in lube, Hughes engines lube in conjunction with a good oil. Without the sufficient level of zinc in the oil during break in, the proper cam wear pattern may not be achieved, thus leading to premature cam lobe failure.
Stock motors with NOS cams may not be as vulnerable to this as new aftermarket cams subject to high spring pressure are.
-Justin
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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