The heart of your 2004 Toyota 4-RUNNER is the 4.0L 6-cylinder engine, identified by the engine code 1GR-FE Z. This robust powerplant requires specific attention to oil viscosity and capacity to ensure optimal performance. The manufacturer recommends a viscosity grade of 5W-30 suitable for all temperatures. When performing an oil change that includes the filter replacement, the system requires 5.5 quarts of oil. After refilling, it is crucial to check the oil level to ensure it is within the correct operating range.
For the oil drain plug, the torque specification is 30 ft/lbs. Using the correct torque prevents thread damage and ensures a proper seal. AMSOIL synthetic oils in this viscosity are designed to provide immediate protection upon startup, reducing wear during those critical first moments of operation. The oils offer superior cleaning power, helping to keep the engine running smoother and longer by fighting sludge and deposits.
Owners looking for the maximum protection possible will find the AMSOIL Signature Series 5W-30 to be an exceptional choice. This product offers up to 25,000 miles of guaranteed protection, effectively blowing the doors off industry standards for oil longevity. If your vehicle has higher mileage, the AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil is formulated with enhanced anti-wear additives and boosted detergents. It reduces sludge by 67% and is guaranteed for 12,000 miles or one year.
Engine and Air Filtration
While oil is essential for lubrication, filtration is what keeps that oil clean. A high-quality oil filter ensures that contaminants are trapped before they can circulate back through the engine. The AMSOIL Oil Filter is engineered to work seamlessly with synthetic oils, offering extended service life and allowing lower restriction to keep engine parts lubricated. It provides filtering efficiency of 99 percent at 20 microns, which is superior to many competing filters.
For those who prefer a replacement option that meets original equipment standards, the WIX Oil Filter is an excellent choice. Its premium media offers improvements over OEM-branded filters, ensuring that the oil change is as effective as the fluid itself. Additionally, keeping the engine breathing clean air is vital for the 1GR-FE Z engine’s performance. The WIX Air Filter utilizes premium media to trap dirt and debris, protecting the internal components from abrasive particles.
Cooling System Maintenance
The cooling system plays a critical role in maintaining engine temperature and preventing overheating. The 2004 Toyota 4-RUNNER requires 10.4 quarts of coolant. For this vehicle, AMSOIL offers the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant. This ethylene glycol 50/50 pre-mix formulation is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making it compatible with all cooling system metals, gaskets, and hoses. It provides protection for up to 150,000 miles or 5 years.
Alternatively, if you prefer a concentrated fluid that offers the longest service life, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is a top-tier option. This product greatly surpasses standards for metallic corrosion and erosion, protecting the engine against extreme thermal stress and providing reliability in both freezing and boiling conditions.
Transmission and Drivetrain Fluids
The transmission in your 4-RUNNER requires precise lubrication to handle the torque produced by the 4.0L engine. Depending on the specific transmission type (such as the A750F or A340F series), the fluid requirements may vary slightly, but synthetic protection is always beneficial. For the automatic transmission, the AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid stands out for its ability to withstand heavy towing and elevated temperatures. It remains fluid in sub-zero temperatures, ensuring smooth operation regardless of the climate.
For a cost-effective option that still offers synthetic benefits, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is designed to protect against wear and resist harmful sludge. If a multi-vehicle formula is needed, the AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid offers the same high-performance characteristics. The corresponding OE version, the AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid, promotes smooth, shudder-free shifts and guards against leaks.
The drivetrain components, including the front and rear differentials and the transfer case, also require high-quality lubrication. The front and rear differentials typically require GL-5 lubricants. The AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube is ideal for these applications, providing advanced protection against wear and controlling thermal runaway. For the transfer case, which may require a GL-5 fluid, the AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube is a robust choice. It helps reduce operating temperatures and contains friction modifiers for limited-slip applications, ensuring long oil and seal life. Other viscosity options like the AMSOIL SEVERE GEAR® 75W-110 and AMSOIL SEVERE GEAR® 80W-90 are also available for various differential applications.
Other Essential Fluids and Maintenance
Braking systems must remain responsive and safe. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is recommended for your 4-RUNNER. It provides excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range. For power steering systems that rely on DEXRON-III Automatic Transmission Fluid, you can use the AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid or the OE version, both of which offer smooth operation and protection against wear.
To keep your fuel system clean and efficient, the AMSOIL P.i.® Performance Improver Gasoline Additive is a powerful tool. It restores GDI fuel injectors to 100% flow rate, improves fuel economy, and reduces the need for higher-octane fuel. For seasonal storage, the AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, while the AMSOIL Engine Fogging Oil protects internal engine components from rust during long periods of inactivity.
Vehicle Background
The 2004 Toyota 4-RUNNER occupies a unique space in the automotive landscape, bridging the gap between traditional body-on-frame trucks and modern crossover SUVs. This generation, built on the 坚固 Tacoma platform, is widely celebrated for its rugged capability and enduring reliability. It is powered by the 4.0L V6 engine, the 1GR-FE Z, a 24-valve DOHC powerplant that delivers a strong blend of torque and horsepower suitable for both highway cruising and off-road adventures. This engine is known for its smooth power delivery and longevity when properly maintained.
Owners of the 4-RUNNER often appreciate its versatility. It serves equally well as a family hauler, capable of carrying passengers and cargo with ease, and as a serious off-roader when equipped with the appropriate four-wheel-drive system. The vehicle’s suspension and frame are designed to handle rough terrain, making it a favorite among outdoor enthusiasts who need a reliable companion for hauling gear to campsites or trails. The 2004 model year represents the continuation of a legacy that began in the late 80s, solidifying Toyota’s reputation for building vehicles that withstand the test of time and harsh driving conditions. Its market position remains strong, with many 4-RUNNERs from this era still actively used on roads and trails today, a testament to its solid engineering and design.