Does anyone know if there is anything special about 'diesel' engine oil?
I took a look at the castrol web site, and for it's GTD diesel oil it's main point was that it had 'A high TBN of 9.7 to counter the acids generated in diesel combustion'. But it's petrol oils had a TBN of 11, so on that basis the petrol oil should be better.
Come on John or Andrew, what do you reckon?
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