I would be very vigilant on using an approved oil until you hit that 12 year 162k mile extended warranty VW was forced to extend on these dieselgate vehicles. I am sure they would love to deny a claim because of it. Keep good records also, of this and other required maintenance. That being said, any 504/507 with official VW approval will be fine, follow the sales on Mobil 1 ESP 5W30 at NAPA or whatever else is out there. TRIAX seems pretty shady as they baited and switched an order on me a couple years ago and their approval/recommended/suitable language is suspect as they make nobodies actual list for approvals, or didn't in the past. I'm using the Mobil 1 ESP but also have Valvoline 504/507 in one vehicle and Red Line in another. At least with Red Line and probably Amsoil, they will stand behind you if there is a dispute about their product suitability if they recommend it. I have also used Ravenol in the past and it is good but somewhat expensive. Motul specific is also a good, sorta expensive alternative. I use Castrol for oil bath air filters.