An XOM document stated that M1 5W-30 ESP uses an ester. But that is probably in a small dosage. They said it also uses Visom Group III. Are you looking for a LL04 oil that has a lot of ester in it? Amsoil's one Euro oil might have a fair amount of ester in it. Doing a VOA and getting oxidation test done is a way to very roughly tell how much ester is in an oil since esters have oxygen atoms in them and get detected in the oxidation test. Red Line in VOAs has tested at around 150 in oxidation tests. So has Motul 300V and some Renewable Lubricants veggie-ester-based oils. Oils with less esters have tested at around 40; for example, some Amsoil oils. Most virgin oils are less than 20 in oxidation.
Is an Ester-based LL04 oil better than a non-Ester-based LL04? If so, how? Just curious.
Well, I've been looking for an 0w-30/40 for my car. I was under the impression that this grade generally is comprised of PAO oils with esters. I wasn't sure if esters would be mixed with dino and PAO but I guess in the case of the M1 ESP 5w-30 that might be true.