Ive had my truck since new in 2012 and it now has around 45k miles on it, so not too many. It has been taken cared for by my mechanic since new, he has been my mechanic for over 20+ years now. I found out just a month ago that he has been using Fuchs Supersyn 5W-40 oil in both my Range Rover and my LR3 HSE (4.4 NA V8). I have done a fair amount of digging and Im almost sure that using that oil is not any worse or better than using the 5W-20 recommended for the 5.0 SC V8 or the 5W-30 for the 4.4 NA V8. I wanted to see what you guys thought? Anything thoughts is great. I also found this on a oil forum and thought was interesting.