Mobil 1's website says:
Quote:
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Many synthetic oils, including Mobil 1, contain a variety of synthetic fluids, and usually this includes esters.
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That's not very convincing, is it?
Mobil 1 also, in the last few years, changed their product from a Group IV synethic to a Group III blend, from my understanding.
If the esters are what you are truly worried about, stick with a Group IV or V such as Redline, Motul, Amsoil or Royal Purple. However, feedback from Mobil 1 and Castrol users indicates sufficient engine protection can be expected from these brands as well, whether or not these necessary esters are present.
None of this information is from my own experiences, only from reading dozens of threads on this subject on this forum.
Threads like these never turn out good.