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 A40 oil?
Strange finding: Ravenol RUP 5W40 has C40 approval and is also recommended for A40
Anyone can explain this?
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 A40 oil?
Strange finding: Ravenol RUP 5W40 has C40 approval and is also recommended for A40
Anyone can explain this?