My comment is he works for GM for 33 years, joke. Gm has wonderful quality and the short warranty on there cars. My wife had a GM car and I went 3 times past the oil sensor light with a synthetic and the oil was fine. Hmmm. I can’t list all the issues with the car since this forum would have no server space.
Based on working with engineers (since I am one), most times when being in one place that long, most are stuck in their ways, big time. We, younger guys seem to be more open and ask why, not just do it. Also GM, need I say more. Step over in aerospace world and see how to design engines. I have seen plenty of auto engineers come to aerospace and they can’t design a blade or burner casing to save their life.
I question the validity of his statements since he posts ZERO from specs (SAE, GM, ASTM, Mil etc). He post nothing on analysis either. So I guess my oil tests are all hype and the oil tests showing better numbers mean nothing. I guess the many people are doing longer drain safely are all liers. Nevermind that many have been doing extended drains longer then I have been alive means nothing. He has some good points but do not focus on the oil.
I love why he states diesel vs gas engines. He states “Simple answer....fuel economy”. I am not auto engineer and there is more to it then that. Next he will say all jet engines are the same.
Or I like the "Their claims of long change intervals are completely nonsense. " ok, sure.
Also the depletion of ZDDP is not linear. Even I know that. He knocks synthetic when some of their own cars have synthetic oils installed in them. I also believe that some can go up to like 15K on the Mobil oil. If a corvette needs synthetic and some other cars do not, what does that tell you? But then on the other hand he is knocking synthetic oil like crazy. He knocks, Amsoil which is fine, but when an engineer does not look past the market and not on facts, time to go to some engineering classes.
In the end, many manufactures do not like synthetic let alone Amsoil. I find it funny that Lexus is going to all synthetic very soon. Nevermind the higher ends cars that go a lot longer on drains.
He seems more like a PR engineer in my book.