Just bought our 3500SL a few days ago. Had to drive out of town since our local Nissan dealer doesn't carry any. They told me warranty service would have to be done at a dealership that was setup for the commercial vehicles. Closest is 30 miles away, not a deal breaker assuming I can drive it there or they will tow it there. What I didn't ask, can my local dealer do the oil changes? Is there a hidden warranty issue? Or even your standard quick lube type place? I'm assuming the process would be similar to a Titan. I've changed my own oil several times, nothing magical about it. I'm going to call my local dealership later when I get a chance, just curious what the community experience has been.