The LS3 of this era will eat anything. I have a 2014 2SS convertible with bolt on mods putting out 425 at the rear wheels (40+ over stock). I’ve always run the spec’d 5W-30, usually a Mobil1 product, currently extended protection. My issue is it only gets about 1000 mi/year (no palm trees here) so I have to figure out what time interval is appropriate. I usually go about 18 months. I would have zero hesitation to put 0W-40 in it. I pay no attention to Dexos. Thats just a revenue extortion by GM. Best accessory for cars used infrequently like ours is a CTEK smart charger.
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