Your spot on this is one of the problems with todays oils. When trying to choose oils i always refer to the Lude Guide from the oil manufacture. They wont recommend it if thay cant back it up.
I manly stick with Valvoline & Fusch oils these days because the data sheets supplied with the oil prove vehicle manufactures have approve the certain oil to be used.
Also i am using Fuchs Titan GT1 Pro C3 5W/30 oil in my Disco Td5. I have always run this in all VW/Audi's where recommend. Its also Fuchs Recommend oil for the Disco Td5.
Cheers
Rhys


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