The basic version of the UZ series engine debuted in August 1989 on the Toyota Crown S130 series, and in October 1989 on the Lexus LS (Toyota Celsior) of the first series (UCF10). It soon appeared on a number of other Toyota and Lexus models. By itself, 1UZ is extremely reliable and is often called a millionaire among the people. This engine is capable of traveling 500 thousand km or more.
Specifications
| Manufacturer | Tahara plant |
| Also called | 1UZ |
| Production years | 1989-2002 |
| Cylinder block alloy | aluminum |
| Fuel system | injector |
| Configuration | V |
| Number of cylinders | 8 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 82.5 |
| Cylinder bore, mm | 87.5 |
| Compression ratio | 10 10.4 10.5 (VVTi) |
| Displacement, cc | 3969 |
| Power output, hp | 256/5400 261/5400 290/5900 (VVTi) 300/6000 (VVTi) |
| Torque output, Nm / rpm | 353/4400 365/4400 407/4100 (VVTi) 420/4000 (VVTi) |
| Fuel type | 95 |
| Euro standards | — |
| Weight, kg | ~165 |
| Fuel consumption, L/100 km — city — highway — combined |
17.4 9.2 12.2 |
| Oil consumption, gr/1000 km | up to 1000 |
| Recommended engine oil | 5W-30 / 5W-40 / 10W-30 / 10W-40 / 10W-50 / 15W-50 |
| Engine oil capacity, liter | 5.0 |
| Oil change interval, km | 7000-10000 |
| Normal engine operating temperature, °C | — |
| Engine lifespan, km — official information — real |
— 400+ |
Frequent problems
The 1UZ power unit is sufficiently resistant to even very minor flaws during the entire warranty period. It practically does not have significant design flaws, structural flaws in general and for individual units. Therefore, if malfunctions make themselves felt, then they all have a characteristic age tint, which manifests itself upon reaching a high mileage. Also, malfunctions can manifest themselves in the absence of technical inspection, the use of low-quality fuels and lubricants and extreme operation.
Often on the motor, candles become unusable. In this case, the main reason is poor gasoline. Replacing them yourself is very difficult. The FE-modification of the motor is so reliable that it has long been nicknamed “millionaire” among the mass of consumers. In any case, with proper maintenance and high-quality fuels and lubricants, the motor is capable of safely departing five hundred or more thousand kilometers.
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