Sir mere saath abhi banda betha hai , 6 years se carient daal raha hai apni cultus men, mjhe bolta hai oil black nae hota mera
Although am telling him oil black hona achi baat hoti hai
PSO and shell have the same base oil in their lubes. Only the additives are different, 19/20 fark hoga bus.
And PSO's synthetic range is quite good