A small fire extinguisher. Having seen what a dry chemical extinguisher did to a friend's sailboat (alcohol stove fire -- what a mess, white powder everywhere), I prefer Halon or CO2 extinguishers but anything is better than nothing. Fire in a diesel is, I suppose, less of a risk than in a gasser, but you could always put out someone else's fire.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970