The Mazda KL-ZE 2.5-Liter V6 Engine is renowned for its reliability and performance, having been fitted to popular models such as the Efini, Eunos, or MX-6 from 1992 to 2002. It distinguished itself from other engine variants in the series, such as the KL-DE and KF-ZE, with a higher compression ratio and different intake manifold. This combination gave it more torque for takeoffs with less vibration at cruising speeds compared to other engines in this series. As such, this highly sought after classic engine can still provide an efficient ride today.
Engine specifications for Mazda KL-ZE 2.5 l
| Displacement | 2497 cc |
| Power system | Distributor Injection System |
| Engine power | 200 hp |
| Torque | 224 Nm |
| Cylinder block | Aluminum V6 |
| Cylinder head | Aluminum 24v |
| Cylinder diameter | 84.5 mm |
| Stroke | 74.2 mm |
| Compression ratio | 10 |
| Engine features | DOHC, VRIS |
| Hydraulic compensators | Yes |
| Timing Chain/Belt | Belt |
| Variable Valve Timing (VVT) | No |
| Turbocharger | No |
| Oil capacity/Recommended oil | 4.0 l 5W-30 |
| Fuel type | Regular |
| Euro class | EURO 3 |
| Average lifespan | 400 000 km |
KL-ZE engine weighs 176 kg (with attachments)
KL-ZE engine number is located on the joint between the block and the head
Fuel consumption Mazda KL-ZE
1995 Mazda MX-6 with a manual transmission as an example (l/100km):
| City | 12.2 l |
| Highway | 7.7 l |
| Combined | 9.2 l |
What cars use the Mazda KL-ZE 2.5 l Engine
| Cronos I (GE) | 1992 – 1997 |
| Capella GW | 1997 – 2002 |
| Efini MS-6 (GE) | 1992 – 1994 |
| Efini MS-8 (MB) | 1992 – 1998 |
| Eunos 800 (TA) | 1993 – 1998 |
| MX-6 II (GE) | 1992 – 1997 |
Problems & disadvantages of the KL-ZE
- Engines of this series are considered quite reliable, but spare parts are expensive
- Watch the cooling system, the aluminum block is very afraid of overheating
- At mileages over 100 000 km oil often oozes from under the valve covers
- The timing belt resources are about 80 km, but valves usually do not rot at timing belt rupture
- Hydraulic expansion joints do not tolerate cheap lubrication and may rattle for up to 50,000 km
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