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Mobil 1 vs. Mobil Delvac 1 ESP  for a Gasoline Engine
 
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Question:
Mobil 1 vs. Mobil Delvac 1 for a Gasoline Engine
I have read on the Internet that Mobil Delvac 1 oils may provide better performance in high-performance passenger-car engines than regular Mobil 1, since they meet CF-4 specs. What about using Delvac in gasoline engines, especially high-performance engines?
-- "Tribological", Richmond, VA
Answer:
Mobil 1 formulas will deliver everything you need for your gasoline engine. In fact, during development, tests are run in both gasoline and diesel engines to demonstrate the outstanding performance of Mobil 1.
 
Mobil Delvac 1 ESP, which is designed for heavy-duty diesels, meets most diesel engine oil specifications, and also meets API SM certification. And because Mobil Delvac 1 ESP operates in a different environment – diesel engines run longer, generate soot and run hotter, it contains different types and amounts of additives than Mobil 1. Even so, Mobil Delvac 1 ESP still meets API SM certification for gasoline engines, and because of its high performance, we would expect it to do a good job of protecting your gasoline engine.
 
If you use your gasoline vehicle in "heavy-duty" service,  Mobil Delvac 1 ESP will provide many benefits compared to conventional oils. When compared to Mobil 1 performance, those benefits may not be as obvious, and in fact, Mobil 1 would be expected to outperform Mobil Delvac 1 in many gasoline applications. (Updated April 2008)
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