I plan to find out the answer soon when I sell my P85DL with ~30,000 miles. I'm ready to sell now but haven't formally listed it yet. I suspect the next few months will see quite a large number of these being sold to move to the newer, quicker. longer range, HEPA filter, AP-2 cars. Many of these owners are waiting until AP-2 begins to have real advantages. In my case I have been renting AP-2 cars when I travel, and I'm just waiting to pull the plug.
Either way, I cannot see that L itself is likely to be any material resale advantage. In reality the biggest change is the inconel temperature sensor vs the old one. That raises max power outputted probable durability, but not enough to make many used car buyers pay extra. OTOH, I do think L will make resale quicker, just as well-equipped models sell faster than do base ones. FWIW, most of the time I suspect 19" wheels will sell better than 21" ones because many buyers will think about tire life and consequent higher operating cost for the 21" cars.
