A few years ago I was riding with a buddy in a tow truck while he was on the job. He went to fill up and accidentally pumped in 75 gallons of gas in the diesel tank that had 15 gallons of diesel in it. He saw his mistake and shut the engine off and called his boss. They towed it down the street to a gas station they owned, positioned it over the unleaded fill and drained the tank into it. 15 gallons in a 3000 gallon tank wasn't a big deal to them, but I wonder if it affected driveability of any of the cars that used it.

BTW, the towing company charged my buddy the cost of the gas against his paycheck - even though they sold it.

__________________
1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer