Hi guys, I've been running Mobil 1 0w40 in my car since my first change with 2,500 miles. I now have just over 15k miles with little if any oil usage and I'm doing a 7.5k mile OCI. Just wondering if there are any better options out there since theres been talks of Mobil 1 0w40 going weaker. NOACK seems to be the hardest stat to find and I've tried searching here and elsewhere for oils under these specs with not much luck. I'm interested more so in the 504 spec oils since they seem to have a higher standard. The car is stock other than a drop in filter and it is run harder than average. I'm considering going with Amsoil Euro 5w30 since it has an actual approval for VW 504 and has really good numbers. Thanks for the info!