Dad had to replace a L83 already...
Gonna ask him what the symptoms were...
Nothing is always 100% perfect.
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Many codes flashing couldn't get rid of. GM had them replace motor.
Most likely just oil weight! These take 0w20 and they are sure it wasn't 0w20 in there.
"Oil capacity has been increased to six quarts for the 4.3L V-6 and eight quarts for the V-8 engines. All engines use GM’s Dexos oil for increased fuel efficiency and longer oil life, and V-8s are engineered to use 0W/20 oil to improve lubrication and reduce friction."










