Tried mobil 1, all variations from 1978 on, tried Delvac, tried Amsoil 5w-30, and Amsoil 0w-30 series 2000. Now since this interest in oil and analyising oil gets to be more of a hobby/obsession than a maintance need, I WANT TO TRY SOMETHING DIFFERENT AND EXOTIC in my next oil. Any suggestions??? Royal Purple is not exotic enough, nor is Redline. How about Motul or other suck eurotrash motor oils???? Present vehicles are 1995 Nissan Maxima v-6 95000 miles run on Mobil 1 and Amsoil since new, and 2001 Toyota Tundra V-8 run on Amsoil since new 29000 miles.