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It is true that Super Tech 15W40 is being updated to CK4. The new formulation is still going to have higher levels of phosphorus and zinc. Super Tech 15W40 CK4 meets Ford's WSS-M2C171-F1 specification. If Walmart maintains the current price of $9.64 per gal for CK4 Super Tech 15W40, this oil...

Mobil issued a statement right after Shell published the results of Delvac Super 15W40 failing the Volvo T-13 Oxidation test. Here is an excerpt of that statement "ExxonMobil cannot address the specifics of the test results Shell produced, because we do not have the data, but we are conducting a...

Posted 7/2/18 The PQIA Speaks to Shell's Claim about Mobil Delvac 1300 Super 15W-40: http://pqiamerica.com/index.html

Given the apparent authenticity along with the details of Shell's report of Delvac 1300 Super 15W40 failing the Volvo T-13 oxidation test, the question arises is how did Mobil achieve the API CK4/SN license for this product? The data from the report, if correct, clearly shows that the oil failed...

I have been researching CK4 rated conventional HDEOs on this website, and I have read many informative postings. As a result, I have come to realize that there are many good conventional HDEOs available in the marketplace. In my area, CK4 conventional HDEO from the big three, Delo, Delvac, and...