Looks like gas chromatography at times below. He seems to like Redline and Amsoil. SA for Amsoil 0w20 is 1.05 and the Noack showed 9.5% (there is a 2% error with Noack testing) and Redline 0w20 had a SA of 1.19.
2020 - Mazda CX-30 - Mobil 1 EP 0w20 2019 - Subaru Impreza - Dealer Oil
Re: Any Spanish speakers here? - Base Oil Gas Chromatography?
Those are infrared spectrograms showing the various functional groups present in the oil samples. Knowing what the functional groups are indicate the types of base oils and other chemical entities that are present in the final blended product.
A gas chromatography or liquid chromatography chromatogram would be much more complex.