I just downloaded the MSDSs for both
Chevron Supreme and
Havoline (ChevronTexaco). Except for the revision dates (09/12/02 for Chevron Supreme, and 09/13/02 for Havoline), the logos, and the individual MSDS numbers, they read identically. Both products use the same percentage of ZDDP, the same percentage of undefined other additives, the same range of "highly refined mineral oil" (C15 - C50), and both apparantly have molybdenum. (The byproducts of combustion list oxides of molybdenum.). Both also list identical physical and chemical properties including specific gravity, boiling point, and viscosity ranges at 100 degrees C.
Absolute proof that Chevron Supreme and Havoline are identical? Nope, but definitely evidence that this question has not been satisfactorily answered by company spokespersons contacted by telephone. I looked for but was unable to find the actual current product data sheets online with numerical ranges of performance. (Seems what is available now is just more advertising text, but no hard numbers...) Unless or until I can be shown otherwise with
current detailed product data sheets, my own attempt at online research suggests to me these "two" products are coming out of the same viscosity grade storage tanks and that any measurable differences are a result of batch-to-batch variability rather than intentional brand specific chemistry/blending considerations. (Company spokespersons are not always an absolutely reliable source. They read from a script. But some have been known to "wing" it on occasion if the specific information request isn't covered.) I'm NOT saying my opinion is infallible. But,
where's the beef? Comments, anyone?