We are currently in the process of doing some repairs on a 300td. They will probably happen over an extended period of time as the car has multiple problems (which is better than multple personalities:p ), and we have limited time available. I don't want to introduce another problem--water condensation in the tank-- just to confuse things. We'll be confused enough

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I know you can use methyl hydrate is gas tanks, how about diesel? Or is there a better choice?
Thanks!
Natalie