: Carefully inspect the rear bottom quarters , sills , floor pans , and door pillars . Parts for the 1970s RX-series are increasingly difficult to source.

Most RX-4 models featured one of two twin-rotor Wankel engines:

: Available as a 2-door coupe , 4-door sedan , and a rare station wagon . Coupes are generally the most valuable among enthusiasts.

: Introduced in 1974, this 1.3L "Anti-Pollution" version offered improved emissions and more torque, though slightly lower peak horsepower ( 125 hp ).

: This is the most vital check. Use a rotary-specific compression tester to ensure the apex seals are intact. Difficulty starting when the engine is hot often indicates low compression.

: Pristine examples are scarce, as many have been modified for racing or scrapped due to engine failures and rust. Engine Options & Specs