I recently made the switch to Amsoil Signature Series for my Silverado. However I am a bit OCD when it comes to maintainance and will more than likely change the oil well before I see any benefit from an extended OCI. I can get Amsoil at PC prices. I also have a 2014 Accord to consider now as well. Prior to my recent OC I had used Mobil1 exclusively and changed the oil in my truck every 3k for no reason other than why not? So that brings me to today. I am getting antsy as I have now passed 3k on this oil change. I'm wondering if there is actually a benefit to using Amsoil over Mobil1. I'm really looking for an unbiased opinion of this if possible. If there is no benefit than I would almost prefer to use Mobil1 since I can get it locally much faster. I have my eye on the XL line as I don't believe signature is of benefit to me unless I'm missing something. What about amsoil oil filters as well? I'm more than likely going to have the dealer continue with oil changes on the Accord. Would you bring in some XL and a filter or just oil and let them put and oem Honda filter in?