The phrase "diesel sibling" refers to a person or thing that is closely related or similar to something else, but uses diesel as its source of power. Full definition
Essentially identical to its gasoline and diesel sibling inside and out, save for a few hybrid - specific features, the Golf GTE uses a drivetrain that marries a small - displacement TSI engine and an electric motor. (topspeed.com)
Differentiating the Passat GTE from its petrol or diesel siblings cosmetically are blue highlights on the grille, a redesigned front bumper, different DRLs and new 17 - inch wheels. (caradvice.com.au)
On the exterior front, the petrol Audi Q3 is identical to its diesel sibling. (motorbeam.com)