Quote:
Originally Posted by Joemann892
https://www.bimmerworld.com/BMW-Engine-Oil/
I was reading the link above and the only thing I read about using diesel motor oil in the B58 or any modern gas engine would be early failure of the catalytic converter. Anyone know anymore about this? I am still planning on using a 5w40 diesel oil like rotella t6 or maybe even Amazon basics 5w40 heavy duty diesel oil.
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Very possible that a diesel oil can harm your cat. How likely is it? You'd need to read the oil's data sheet. Specifically, looking at the Valvoline 5W-40, it meets API SN, which is a gasoline oil rating and is designed for vehicles with particulate filters, EGR, and emissions devices.
The phosphorus and zinc is high, which are two elements that can cause damage to cats.
https://sharena21.springcm.com/Publi...2-ac162d889bd1
Now saying this, I've yet to hear of a failed cat from diesel oil use. These are anecdotal and not scientific, but if you head over to read Rotella T6's reviews on Amazon, you'll find people that run it in everything from a 7.0 Cummins turbo-diesel, to a Kawasaki bike, to a Miata, and to a WRX.
This scientific article says yes, it can harm cats:
https://www.researchgate.net/publica...ne_dynamometer