How does Chevron synthetic compare to conventional?

[Mystic]

How does Chevron synthetic compare to the conventional Chevron motor oil? I know that the Chevron Synthetic may well be Group III instead of PAO or esters but it is cheaper than Mobil 1 and is it a good motor oil?

Can you mix a quart of Chevron synthetic with conventional Chevron Supreme and create a somewhat better oil? Are the additives and the base stocks compatible?

 

[Mystic]

We know from VOAs and UOAs displayed at this web site that Chevron Supreme is a very good conventional motor oil. Would a quart of Chevron synthetic replacing one quart of the conventional greatly improve the motor oil? Is the synthetic Chevron compatible with the conventional?

 

[Ray H]

According to Chevron's material safety data sheets, the base oil in their "synthetic" is a combination of an ester and either PAO or Group-III base stocks. Both are miscible with conventional dino's and Chevron Supreme conventional dinos use Group-II (perhaps in cobination with Group-II+?) base stocks. While the additive packages would differ, I doubt that running a quart of Chevron's own synthetic with a short fill of Chevron's "ISOSYN" conventional would do any harm at all. And, you'd be getting and maintaining a layer of ester on all oil-exposed metal parts as further wear protection in the process.