Quote:
Originally Posted by niky
The cure, obviously, is conversion to biodiesel, but I've heard tell of issues with esters and valve recession. And you still have viscosity issues, deposit issues,m pump and injector failure, oil dilution (still!) and etcetera. The worst being the diesel particulate filter issue, which can cause engines to go bye-bye. Cummins is supposed to be one of the few manufacturers who uses a separate injector for DPF, which means it should be more friendly to biodiesel than most.
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Here in the US, I believe Cummins' heavy duty engines (the ISX 15L engine for example) use a separate aftertreatment fuel injector, but their smaller engines (like the 6.7L) don't. I know their Euro 4 & 5 engines (6.7L & 4.5L) did not have DPF's so it's a moot point.
In the US Cummins is now approving up to 20% biodiesel. I'm not sure what the issue is with going higher-whether it's oil dillution or material compatibility.