BMW 3.0Si Parts & Accessories

BMW 3.0Si Parts & Accessories

The BMW 3.0Si is the fuel-injected crown jewel of the E3 large sedan family, pairing Bosch D-Jetronic injection with the 3.0-liter M30B30 for smoother power delivery and improved refinement over the carbureted 3.0S. These top-spec E3 sedans are increasingly collectible and reward careful maintenance with exceptional driving character.

Popular Upgrades

Owners turn to free-flow exhaust headers and cat-back systems to improve M30B30 breathing without altering the car's reserved character. Full suspension refreshes with polyurethane bushings and quality dampers transform chassis feel, while stainless brake lines and improved pads restore the stopping confidence these luxury sedans require.

How does the 3.0Si D-Jetronic injection differ from the carbureted 3.0S?

The D-Jetronic system uses manifold absolute pressure and intake temperature sensing to calculate injection timing, giving the 3.0Si smoother idle quality and more consistent throttle response than the twin-carb 3.0S. Cold-start behavior is also improved with the auxiliary air regulator and cold-start valve.

What is the best way to maintain the BMW 3.0Si injection system?

Regular injector cleaning, throttle body service, and periodic fuel filter replacement keep the D-Jetronic running cleanly. Checking the vacuum hoses for age-related cracking and testing the coolant temperature sensor accuracy prevents the most common running issues on these classic fuel-injected sedans.

Keep your BMW 3.0Si in top condition with parts from Black Ops Auto Works. Browse our exhaust, suspension, and brakes collections.