From 1983 to 1995, the company produced the 1.8-liter Mitsubishi 4D65 diesel engine, which was fitted to a number of its passenger models, including the Colt, Lancer, and Galant. There were two versions of this power unit available: atmospheric and turbocharged.

The 4D68 engine is another member of the 4D6 family.
The engine was mounted on:
- Mitsubishi Colt 2 in 1983 – 1987;
- Mitsubishi Lancer 2 in 1983 – 1987;
- Mitsubishi Lancer 3 in 1987 – 1991;
- Mitsubishi Lancer 4 in 1991 – 1995;
- Mitsubishi Galant 5 (E1) in 1983 – 1987;
- Mitsubishi Galant 6 (E3) in 1987 – 1992.
Specifications
| Production years | 1983-1995 |
| Displacement, cc | 1795 |
| Fuel system | prechamber |
| Power output, hp | 60 (4D65 Non-Turbo) 75 (4D65T Turbo) |
| Torque output, Nm | 113 (4D65 Non-Turbo) 152 (4D65T Turbo) |
| Cylinder block | cast iron R4 |
| Block head | aluminum 8v |
| Cylinder bore, mm | 80.6 |
| Piston stroke, mm | 88 |
| Compression ratio | 22.2 |
| Features | no |
| Hydraulic lifters | no |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | no (4D65 Non-Turbo) yes (4D65T Turbo) |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 5.6 |
| Fuel type | diesel |
| Euro standards | EURO 1 (4D65 Non-Turbo) EURO 2 (4D65T Turbo) |
| Fuel consumption, L/100 km (for Mitsubishi Galant 1990) — city — highway — combined |
9.5 5.4 7.3 |
| Engine lifespan, km | ~250 000 |
| Weight, kg | 180 |
Disadvantages of the Mitsubishi 4D65 engine
Oil leaks from gaskets and seals are the main source of issues for owners;
Although the timing belt is intended to last 90,000 kilometers, it may break sooner and shatter the rocker;
The engine pulleys frequently burst, particularly the one that sits on the crankshaft; on long runs, cracks frequently appear in the area of the prechambers of the head of the block; the balance shaft belt serves approximately 50,000 kilometers and falls under the timing when it breaks.
