When I bought my Tacoma (used), I also changed the oil early even though the selling dealership said they did a full service (early, meaning I changed it at 3,000 miles).
About the OCI for your Lucerne, you don't say how you drive it. This matters a lot. Short trips, long highway runs, easy throttle or foot-to-the-floor, etc. Ambient temps matter also... cold winters in NB (salt comment). Generally it's best to follow the owner's manual especially during the warranty period. Manufacturers put some effort into developing the OLM function, but if the service light comes on before the interval in the manual, do the service. (I.e. whichever comes first.) The Valvoline conventional you're using is good oil and the Napa Gold filters are excellent. You should be able to go till spring, just be sure to run it up to full temp and keep it there for a while, at least once per month.
This may seem like very simple and basic feedback (for a BITOG post) but I prefer to keep things simple wherever possible. Enjoy your new ride.