I have a 2005 Nissan Armada with a little over 110,000 miles on it. Use it for everything especially towing. Synthetic oil has always been used (I'm the second owner since 81,000 miles). First owner used Mobil 1 and I've been using Castrol GTX Edge w/ Titanium & Royal Purple, along with royal purple filters. I'd like to know if these engines need certain oil or should avoid any. Don't know much about these engines and would want to have someone who knows them share some wisdom about how to take care of them. The endurance has a lot of valves and moving parts and would want this engine to make it well over 200,000 miles. I've read some good things about Liqui Moly oils, Redline and Amzoil.....are they worth it? Also been thinking about putting on a Frantz Oil filter as well, over kill?