Since California diesel is already very good (by US standards) 53 cetane, the only concern for me is lubricity so I use 1oz/gallon of TCW3. Biodiesel is hard to find around here and I'm not going to pay a premium for it. I tried Diesel Kleen but realized it was a waste of money for me. I'll save the rest of it for when I drive out of state.

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CENSORED due to not family friendly words