The 2018 Toyota Yaris is a compact vehicle known for its reliability and fuel efficiency, but like any machine, it requires specific lubricants to maintain peak performance. The engine utilizes a 1.5L 4-cylinder unit (Engine Code 1NZ-FE 2) which operates best with SAE 5W-30 synthetic motor oil. Using the correct fluids not only ensures smoother operation but also extends the service intervals and protects critical components from wear, especially in extreme temperature conditions or during stop-and-go city driving where the Yaris is most commonly used.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Provides the highest level of engine protection, offering up to 25,000 miles of service and superior resistance to thermal breakdown for the 1NZ-FE engine.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – A cost-effective choice that delivers up to 20,000 miles of protection with enhanced cleaning power to keep the engine running smoothly.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – Formulated to outperform conventional oils and OEM specifications while fighting sludge and deposits effectively.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Specifically designed for engines with over 75,000 miles, featuring a boosted detergent package and reduced sludge formulation.
- WIX Oil Filter – A premium filtration option that offers improvements over standard OEM-branded filters to ensure clean oil circulation.
- WIX Air Filter – A premium filtration option that keeps the engine breathing clean air.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed, phosphate- and nitrite-free solution that protects the cooling system for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated antifreeze solution that protects against corrosion and overheating.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Delivers superior protection for the U340E transmission, remaining fluid in extreme cold and resisting temperature-related wear.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides reliable protection against wear for the automatic transmission system.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS responsiveness and maintains stable viscosity across a wide temperature range for safer braking.
- AMSOIL Gasoline Stabilizer – Helps keep fuel fresh up to 12 months during seasonal storage.
- AMSOIL Engine Fogging Oil – Protects internal engine components during storage or long periods of inactivity.
- WIX Cabin Air Filters – Keeps the interior air clean by filtering out dust and debris.
- AMSOIL P.i. Performance Improver Gasoline Additive – Restores horsepower and fuel economy by cleaning fuel injectors and combustion chambers.
- AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor – Lubricates fuel system and upper cylinders to reduce wear.
- AMSOIL Synthetic Multi-Purpose Grease – Resists thermal and oxidation degradation for long-term performance.
- AMSOIL Heavy-Duty Metal Protector – Contains special rust and corrosion inhibitor additives to protect against salt and moisture.
- AMSOIL MP Metal Protector – Cuts through rust and frees frozen components.
- AMSOIL Silicone Spray – Protects with a dry lubricating film ideal for surfaces that may be damaged by conventional lubricants.
- AMSOIL Heavy-Duty Degreaser – Dissolves oil, tar and grime to clean engine surfaces and parts.
- AMSOIL Power Foam Carburetor and Induction-System Cleaner – Cleans deposits from ethanol and degraded fuel to maximize horsepower.
- AMSOIL Miracle Wash Waterless Wash and Wax Spray – Leaves vehicles with a fantastic shine and tough protective finish.
- AMSOIL Brake and Parts Cleaner – Quickly removes oil, grease, brake fluid and other contaminants.
- AMSOIL Mudslinger Mud and Dirt Repellent – Provides a protective, non-stick layer of armor against the accumulation of mud, dirt and snow.
- AMSOIL Engine Degreaser – Professional-strength formula that quickly removes grease, dirt and grime from engine surfaces.
- AMSOIL Glass Cleaner – Effectively cuts through grease and grime without running or dripping.
- AMSOIL High-Foam Car Shampoo – A high-foam formula that is hard on dirt, gentle on coatings and finishes.
- AMSOIL Exterior Ceramic Spray – Provides protection against UV rays and sheds water rapidly.
- AMSOIL Interior Detailer – Light Lemon – Multi-surface use with 90-day UV protection.
- AMSOIL Interior Detailer – Scent Free – Multi-surface use with 90-day UV protection.
Engine Oil and Filtration for the 1.5L 4-Cylinder
Proper lubrication is the lifeblood of the 1NZ-FE 2 engine found in your 2018 Yaris. This engine is designed to run on SAE 5W-30 viscosity for a balance of fuel economy and cold-start protection. When servicing your Yaris, you need approximately 3.9 quarts of oil when changing both the oil and the filter. The oil drain plug requires a torque of 28 ft/lbs, and it is essential to install a new washer on the drain bolt during every service.
Among the top recommendations is the AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil. This synthetic motor oil is engineered to withstand the rigors of daily driving, offering 75% more engine protection against horsepower loss and wear compared to conventional standards. It is the ideal choice for drivers who want to extend their oil change intervals up to 25,000 miles or one year, provided the vehicle is operated under normal conditions. This fluid ensures that your engine remains cool and clean, reducing the risk of sludge buildup that can clog critical oil passages.
For those seeking a balance between performance and value, the AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil is an excellent alternative. With 37% more cleaning power, this oil helps keep the engine running smoother for longer. It is designed to protect against low-speed pre-ignition (LSPI) and guarantees protection for up to 20,000 miles. If your vehicle is reaching higher mileage, the AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil is specifically formulated with enhanced anti-wear additives and a unique chemistry to reduce sludge by 67%, helping older engines perform better.
The filtration system is equally critical. The WIX Oil Filter used in conjunction with these oils offers premium media that outperforms many original equipment manufacturer-branded filters. This combination ensures that contaminants are captured effectively, allowing the oil to flow freely and protect the engine’s internal components. Always remember to replace the filter with every oil change to maintain peak efficiency.
Transmission and Fluid Systems
The automatic transmission in the 2018 Toyota Yaris, specifically the U340E model, requires a fluid that can handle the demands of stop-and-go traffic and varying temperatures. For a total fill, the transmission requires 6.8 quarts, while an initial fill holds 2.6 quarts. Maintaining this fluid is vital for smooth shifting and preventing costly wear on the transmission gears and clutches.
AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is the superior choice for this application. It is designed to withstand heavy towing, elevated temperatures, and challenging terrain, while remaining fluid even in sub-zero conditions. This fluid provides reserve protection during heavy use, ensuring your transmission shifts smoothly for a longer period than conventional fluids.
For drivers who prefer a more budget-friendly option without sacrificing essential performance, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers reliable protection against wear. Additionally, the braking system should be maintained with AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid. This fluid provides excellent ABS and traction-control responsiveness, maintaining a stable viscosity over a wide temperature range to ensure safe braking performance in all weather conditions.
Cooling and Seasonal Care
The cooling system in your Yaris is designed to keep the engine at optimal operating temperatures. The system holds approximately 4.9 quarts of coolant. Using a high-quality antifreeze is crucial to prevent corrosion, boiling, and freezing, which can lead to catastrophic engine failure. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a pre-mixed 50/50 formulation that protects all cooling system metals, gaskets, and hoses. It is phosphate-, nitrate-, nitrite-, and silicate-free, making it compatible with a wide variety of cooling systems and safe for the environment.
For those who prefer to mix their own coolant, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is a concentrated option. This formulation is highly resistant to corrosion and erosion, surpassing OEM standards significantly. It is ideal for protecting your vehicle’s engine during harsh winters or hot summers, ensuring reliable operation for up to 150,000 miles or five years.
For seasonal storage, the AMSOIL Gasoline Stabilizer helps keep fuel fresh up to 12 months, protecting against varnish and gum buildup. Additionally, the AMSOIL Engine Fogging Oil is a highly-effective rust preventive designed to protect internal engine components during storage or long periods of inactivity.
About the 2018 Toyota Yaris
The 2018 Toyota Yaris represents the culmination of Toyota’s long-standing commitment to building practical, economical, and dependable compact vehicles. Part of the global Yaris lineup, this model is designed primarily for urban environments, offering a small footprint that makes parking and navigating tight city streets a breeze. Powered by the 1.5-liter 4-cylinder 1NZ-FE engine, the Yaris delivers a smooth and predictable driving character that prioritizes fuel economy and low operating costs over high horsepower. This engine is a proven design known for its durability, though it relies heavily on consistent maintenance to maintain its longevity and efficiency.
Owners appreciate the Yaris for its straightforward design and lack of unnecessary complexity. As a subcompact sedan, it serves as an excellent entry-level vehicle for new drivers or a practical second car for households looking to minimize expenses. The interior is functional, and the driving dynamics are composed, providing a sense of control that makes it an ideal daily driver for commuters. The vehicle’s origins lie in Toyota’s global engineering strategy, designed to meet the specific needs of diverse markets, including North America, where it has found a dedicated following for its reliability and value proposition.
However, even the most robust vehicles face common challenges over time. For the 2018 Yaris, one of the primary issues owners may encounter is oil consumption, particularly in higher-mileage examples of the 1NZ-FE engine. The engine can burn oil more rapidly than expected if not treated with a high-quality synthetic oil that seals effectively and reduces blow-by. Using AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil can significantly mitigate this issue by replenishing the necessary additives to reduce oil consumption and restore engine compression.
Another common problem in this generation of Yaris is the buildup of carbon deposits on the intake valves and fuel injectors, which can lead to rough idling and a loss of power. This is often exacerbated by direct injection and ethanol-blended fuels. Regular use of AMSOIL P.i. Performance Improver Gasoline Additive can help clean these deposits, restoring fuel economy and horsepower by ensuring the injectors flow at 100% capacity.
Furthermore, transmission issues can arise in the form of harsh shifting or fluid degradation, especially if the vehicle is used for towing or driven in stop-and-go traffic. The automatic transmission fluid can break down over time, leading to wear on the clutch packs. Switching to AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid can extend the life of the transmission by maintaining fluid stability and providing superior lubrication under load.
Finally, cooling system failures due to corrosion or overheating are a risk if the coolant is not replaced regularly. The radiator and hoses can suffer from age-related degradation, leading to leaks or overheating. A proactive approach using AMSOIL Passenger Car & Light Truck Antifreeze & Coolant ensures that the cooling system is protected against corrosion and freezing, preventing expensive engine damage and keeping the 2018 Toyota Yaris running smoothly for many more miles. By addressing these common areas with the right AMSOIL products, owners can maximize the life and performance of their vehicle.