An NMR-based system (10) to analyze one or more of the following: (i) crude oil property, (ii) crude oil rheology of crude oil, comprising an NMR device (11) for providing time and/or batch resolved NMR analysis and/or crude oil rheological profile, said NMR having a crude oil inflow pipe (13), and is in a fluid connection (14) with a crude oil refinery facility (12); wherein said system further comprising a computer readable medium configured to store a retrievable crude oil NMR analysis and/or crude oil rheological profile of a desired crude oil product (standard crude oil product, SCOP), thereby providing said system means to compare NMR analysis and/or crude oil rheological profile of said SCOP with said time or batch resolved crude oil.