Day: July 3, 2018

Shell Claims a Sample of Delvac 1300 Super 15W-40 CK-4 Doesn’t Meet Spec

by Thomas F. Glenn The Petroleum Quality Institute of America received a number of phone calls and emails recently with questions, comments, and opinions about the claim Shell is publicly making that through its testing, Shell “discovered that a sample of Mobil Delvac 1300 Super 15W-40 not only failed the requirements of API CK-4, but… Read More ›