Toyota 12HT Engine: Specs, Configuration, and Service Intervals

Toyota 12HT Engine Specs

The Toyota 12HT engine is a diesel engine that was produced by Toyota Motor Corporation from 1982 to 1990. It is a 4.0-liter, inline-six engine known for its reliability and durability. The engine was primarily used in Toyota Land Cruiser models, particularly the 60 series and the HJ61.

Engine Configuration

The Toyota 12HT engine features an inline-six configuration, meaning it has six cylinders arranged in a straight line. This configuration provides a smooth and balanced operation, resulting in reduced vibrations and improved performance. The engine is also equipped with an overhead camshaft design, which allows for precise valve control and efficient combustion.

The 12HT engine is turbocharged, meaning it utilizes a turbocharger to increase the amount of air entering the combustion chamber. This results in improved power output and fuel efficiency. The turbocharger used in the 12HT engine is a fixed geometry turbocharger, which provides a consistent boost pressure throughout the engine’s operating range.

Engine Oil Specs & Service Intervals

Proper engine oil specifications and regular maintenance are crucial for the longevity and performance of the Toyota 12HT engine. Here are the recommended engine oil specifications and service intervals:

• Engine Oil Type: The recommended engine oil for the Toyota 12HT engine is a high-quality diesel engine oil with a viscosity of 15W-40. It is important to use oil that meets the API (American Petroleum Institute) specifications of CF or higher.
• Oil Capacity: The oil capacity of the 12HT engine is approximately 9.5 liters (10 quarts).
• Oil Change Interval: It is recommended to change the engine oil and oil filter every 5,000 kilometers (3,000 miles) or every six months, whichever comes first. Regular oil changes help remove contaminants and maintain proper lubrication.
• Oil Filter Replacement: The oil filter should be replaced during every oil change to ensure proper filtration and prevent engine damage.

It is important to note that these specifications and service intervals are general recommendations. It is always best to consult the vehicle’s owner’s manual or a certified Toyota technician for the most accurate and up-to-date information specific to your vehicle.

Detailed Engine Specifications

The Toyota 12HT engine is a reliable and powerful diesel engine that has proven its capabilities in various Toyota Land Cruiser models. With proper maintenance and adherence to recommended service intervals, this engine can provide many years of dependable performance.