Mazda KL-DE 2.5L Engine For Sale

Mazda KL-DE 2.5L V6 Engine.
Refined Power with Proven Reliability

Mazda KL-DE 2.5L V6 Engine is a true symbol of Mazda’s engineering excellence during the 1990s and early 2000s. Part of the Mazda K-series engine family, the KL-DE was designed to deliver refined performance, smooth operation, and long-term durability. Found in popular models such as the Mazda MX-6, Mazda 626, Mazda Millenia, and the Ford Probe GT, this engine earned its reputation for being both powerful and remarkably smooth for its class.

The KL-DE features a 2.5-litre (2497 cc) DOHC 24-valve V6 configuration, crafted from lightweight aluminium alloy for the cylinder heads and block, promoting efficient cooling and reduced weight. Equipped with electronic fuel injection (EFI) and variable resonance intake system (VRIS), it offers a seamless power curve across the rev range. Producing approximately 164 hp (122 kW) @ 6000 rpm and 220 Nm (162 lb-ft) of torque @ 4800 rpm, the KL-DE combines responsive acceleration with reliable highway cruising power.

Furthermore, compression ratio of 9.2:1 allows compatibility with regular unleaded fuel while maintaining efficient combustion. The cooling system is water-cooled with an electric fan, ensuring stable temperatures even under demanding conditions. Moreover, with a timing belt-driven camshaft system and a total oil capacity of 4.5 litres (recommended 10W-30), this engine achieves impressive balance between power, refinement, and maintenance simplicity. The KL-DE weighs around 170–180 kg (dry), making it compact for a V6 while maintaining a low centre of gravity for improved vehicle dynamics.

Common Weaknesses & Maintenance Notes

Despite its reputation for dependability, the Mazda KL-DE does have a few common weaknesses owners should note. The most frequent issue involves timing belt wear neglecting scheduled replacement (every 90,000–100,000 km) can lead to serious engine damage. Valve cover gasket leaks and rear main seal seepage may occur with age, typically caused by heat exposure and hardened rubber seals. Moreover some units may also experience idle fluctuations or hesitation due to dirty throttle bodies or failing mass airflow sensors (MAF).

Regular maintenance such as timely oil changes, use of quality filters, and proper cooling system care—can easily keep the Mazda KL-DE 2.5L V6 Engine running beyond 300,000 km. Enthusiasts often praise its balance of performance, refinement, and longevity, making it a solid choice for both restoration projects and reliable daily use. Each engine we supply is inspected, compression-tested, and imported directly to our warehouse, guaranteeing high quality and long-term reliability.