Poll: Synthetic/Conventional/Blend

Rotella in my 2500 HD Diesel change every 3K, not sure what I'll run in the 360, It has some kind of break-in oil in it now not sure what. Have a friend that swears by Royal Purple but then he swears by every new thing that comes along. He ran Amsoil for years in his motor-home with a dual filter set up where he changed the first filter every 5K and both every 10K and just added oil 1 or 2 quarts he lost with the filter. I thought he was nuts, oil is the cheapest think we buy for our cars. I'll keep reading the thread.