Hi sully, this happend about 2-3 months ago. Basically Amsoil is doing what Mobil has always done, and formulating more towards fuel efficiency. One reason many liked the ASL/ATM was bc it was more on the thicker side of the 30wt scale and for SOME cars, that is what worked best. Amsoil has followed the rest of the industry going more towards the fuel efficiency route. The S3k still meets the ACEA A3 spec and that is what should be used if that spec is called for.