I have been seriously tempted to get a 2015-2016 RR 4.4 AB LWB but we cannot get in the states. I am in Costa Rica and I see a 2013 for sale was going to drive it to see how it feels. Is it same as the 15-16? I have been trying to research common problems but it gets confusing cause certain eras have their own. From what I can see the 15-16 has issues with oil level sensor, anything else?

There's a generic L405 buyers guide in the wiki - https://www.fullfatrr.com/forum/post451066.html#451066

Other than that, I don't know of a summary, you would just have to scroll through the L405 technical folder or do a search. My search tip is to use the + symbol in front of each word, that brings back threads that contain all the words eg. +SDV8 +problem