Quality: What buying by price gets
Here we have two samples of Diesel Motor Oil produced by YPFB, the Bolivian government plant. When it was owned by Petrobras they registered and made products to API standards, although they were still Group I base oils.
This first sample is their current best product: YPFB Multigrado Plus. It is new oil, taken straight from the drum. It has a CF-4 on the label, even though that is an obsolete category. You can see it barely meets the viscosity requirements of a 15W-40 and is very low in additives.