Diesel Fuel For Cars and Trucks that are on the Road is supposed to be dyed Green.

Diesel Fuel for off road use like Farm Equipment is dyed Red.

In the past Disel Fuel was some shade of yellow. In fact the first time I encountered Off Road Diesel I though the Fuel had Rust in it as I had previously seen when the Steel Fuel Tank the Diesel Fuel was in was rusting inside. However, the Fuel Tank was Aluminum.

Later I learned the truth.

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84 300D, 82 Volvo 244Gl Diesel