I'd like to hear his "evidence." I'm skeptical, but I suppose it is entirely possible that the fires were not an act of arson, but accidental -- a small campfire out of control, for instance. I wouldn't dismiss the possibility entirely.

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)