Actually, the only reason that I have different manufacturer's products is that I searched around the Charlotte area for suppliers. SO I bought some of each. My next change will most likely be using one or two (at most) types.%[email protected]SFTL-1 said:Mobil, Amsoil, Redline - all great oils! But you need to go to 3 different sources to get them all and possibly a 4th depending on what filter you're using? Too inconvenient for me.