Produced from September 1935 to December 1937, the small Opel P4 was a very popular model at the time, since more than 65,000 units were produced during this short period. The P4 did not replace any model called P3, but owes its name to the 4 people that it can carry on board despite its length (only 3.34 m/132 in.). The successor of this model was the first-generation Kadett.