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I got the same recall on an 07 Acadia. Luckily I never followed the OLM.
I've seen plenty of those 3.6's with that problem. Probably not a coincidence that they didn't look so clean on the inside. The cams wear into the head material and when the cam sensor is so far out of line it eventually turns on the check engine light. Then you need heads, cams, timing chains, and a ton of labor.
Most engines are more robustly designed to handle oil that is a bit wore out. But when a more fragile one get's that much damage when following the OLM long oil change intervals - what does that tell you about high mileage oil?
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