We use straight biodiesel in the wagon's main tank, and it smells just like we're burning the WVO in the VO tank...can't really tell the difference. I haven't really taken notice to different blends, this winter when I start cutting it with diesel, I'll have to pay attention.

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now