Good quality: WTI is taken into account a "light sweet" crude oil, that's easier to refine, whilst Brent is really a mixture of crude oils, such as both equally "light sweet" and "major bitter" grades. Screening is by references that POs talk to one another for, not by released assessments https://seozdirectory.com/listings13214865/how-much-you-need-to-expect-you-ll-pay-for-a-good-massage