Search results

As long as there is no harm for C40 in an engine that requires A40, I would like to try it. Porsche said C40 is not backward compatible with A40. This keeps me worry.

Yup, You are correct that Reline only recommends for A40 only, no approval.

Do you think I can use C40 to replace A40 if OCI can be done shorter, say 5000km instead of 8000-10000km? I wonder both Red Line 0W40 and Euro Series 5W40 have A40 approval but their TBN values are 7.54 and 7.2 respectively. And many oils with both A40 approval and ACEA C3 have even lower TBN...

Do you mean A40 has less fuel dilution issue than C40 or older Porsche models engine have more serious fuel dilution issue than newer Porsche models engine?

Understood that A40 oil cannot be used on new Porsches with sensitive exhaust particle filters When C40 oil outperforms A40 in several ways, then why is C40 oil not backwards compatible with vehicles that require A40? What would the bad result be if C40 oil were poured in an engine that needed...