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Mobil Delvac 1 5W30 Advanced Synthetic oil is a mixed fleet oil that can be used in both diesel and gasoline engine applications. The oil carries a dual API rating that is CK-4/SP. In terms of its gasoline engine use, is the phosphorus level of the oil governed by the SP rating, meaning...

I checked Pennzoil's website for an oil recommendation for a Chevy Silverado 3500HD gasoline engine powered pickup truck, and Pennzoil recommended Pennzoil Platinum 5W30 which meets Dexos1 Gen 3. When I checked the Technical Data Sheet (TDS) for this oil, I noticed the viscosity is on the thin...

I noticed that Valvoline has discontinued Premium Blue 8600 ES heavy-duty diesel oil, and they are now blending Valvoline Premium Blue One Solution Gen2 in 10W30 and 15W40. Premium Blue On Solution Gen2 is being marketed a universal mixed fleet oil for diesel, natural gas, and gasoline...

I just reviewed the PDS for Rotella T4 15W40, and I noticed that Shell now lists this HDEO as a synthetic blend. To confirm this claim, I contacted Shell and received a response stating that the formulation for Rotella T4 15W40 was upgraded to a synthetic blend in January of this year (2021)...

Here is the latest heavy-duty diesel oil (HDDO) VOAs posted on the PQIA: https://pqia.org/2020/05/14/castrol-gtx-and-ford-motorcraft/

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...