Start with what the Opel 12/14 HP is: a car with gasoline engine, from Opel. What it meant takes a little longer.
The hardware
The engine is gasoline engine. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Family and rivals
Its Opel stablemates include the Opel Sintra and the Opel K-180.
The record
The open record for the Opel 12/14 HP carries no verified engine, output, weight or price yet. MotorJury does not fill gaps with guesses; this entry gives the model a home in the catalogue and grows as sourced specifications and photographs arrive. Corrections: corrections@motorjury.com.
Opel1862