Hey guys,

Looking for some advice on a single tank SVO system. I'm currently running a blend of 30% petro diesel and 70% veggie oil through a Kayori heat exchanger in a 240D. In the summer I replace the petro with biodiesel.
My problem is rough idle with the petro diesel. The car idles fine until it hits operating temp. This leads me to assume that the hot diesel is causing the idle problems. That, and the fact that it idles well without petro.
Is the hot diesel causing damage to the engine at a 30/70 mix? Should I bypass the heat exchanger for the rest of the winter and run a petro/biodiesel blend? I live in Northern California. Thanks,

Otto