Keeping your 2004 Jaguar S-Type running with the precision it was designed for starts with selecting the right lubricants. This luxury sedan, equipped with the 3.0L AJ27 V6 engine, demands fluids that can handle both its performance requirements and the realities of age. Using high-quality synthetic lubricants ensures that your engine, transmission, and differential components remain protected against wear, heat, and contamination, extending the vehicle’s lifespan and maintaining its driving characteristics.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – The premium choice offering up to 25,000 miles of protection with superior horsepower retention and wear reduction for the AJ27 engine.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – A robust alternative providing 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 specifically to fight sludge and deposits while meeting original equipment manufacturer standards for reliable performance.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – An ideal selection for vehicles with over 75,000 miles, featuring boosted detergents to reduce sludge and control oil consumption.
- AMSOIL Oil Filter (EAO34) – Engineered with 99% filtration efficiency at 20 microns to capture small contaminants and allow lower restriction for better lubrication.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed OAT formulation providing protection for up to 150,000 miles or five years, compatible with all cooling system metals and hoses.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option for ultimate corrosion protection and extended service life in passenger cars and light trucks.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand the rigors of heavy towing and elevated temperatures while maintaining fluidity in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides reliable protection against wear and promotes smooth, shudder-free shifts for the 6HP26 transmission.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with stable viscosity across a wide temperature range.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – Advanced protection for the rear differential, controlling thermal runaway and protecting against rust and corrosion.
- AMSOIL P.i.® Performance Improver Gasoline Additive – Restores up to 14% horsepower and cleans GDI fuel injectors to ensure maximum fuel economy and performance.
Engine Oil and Filtration Specifications
The heart of your 2004 Jaguar S-Type is the 3.0L AJ27 V6 engine. To maintain its performance, AMSOIL recommends using 5W-30 viscosity motor oil, which is the preferred grade for this specific engine code [F]. When performing an oil change, the system requires a total capacity of 6.9 quarts when including the filter. This capacity ensures that all critical internal components are adequately lubricated and cooled during operation.
For the best protection, the Signature Series 5W-30 100% Synthetic Motor Oil stands out as the top-tier option. It is built to offer up to 25,000 miles of protection between changes, making it an excellent choice for drivers who want to maximize their service intervals without compromising on engine health. The synthetic base stock and additive package are rigorously tested to provide 75% more engine protection against horsepower loss and wear compared to conventional oils. Additionally, it helps turbocharger protection and minimizes oil consumption, keeping the engine clean and running smoothly.
If you prefer a balance of extended service intervals and cost-efficiency, the Extended-Life 5W-30 100% Synthetic Motor Oil offers up to 20,000 miles of guaranteed protection. This oil features 37% more cleaning power to help keep the engine running smoother and longer. It is also specifically formulated to protect against LSPI (Low-Speed Pre-Ignition), ensuring reliability even under demanding driving conditions.
For those seeking an affordable yet high-performance synthetic option, the OE 5W-30 100% Synthetic Motor Oil fights sludge and deposits effectively. It meets the specifications required for modern engines and provides a robust barrier against wear. If your Jaguar has accumulated significant mileage, specifically over 75,000 miles, the 5W-30 100% Synthetic High-Mileage Motor Oil is a specialized choice. Its unique chemistry includes boosted detergent and dispersant packages to reduce sludge and control oil consumption, helping older engines perform better and last longer.
Proper filtration is just as critical as the oil itself. The AMSOIL Oil Filter is designed to complement the synthetic oils. It provides 99% filtration efficiency at 20 microns and features a higher capacity for contaminants than standard filters. This helps reduce engine wear and extends the life of the oil change interval. Alternatively, a WIX Oil Filter is available, offering premium media that surpasses original equipment manufacturer standards. When changing the oil, ensure the drain plug is torqued to 18 ft/lbs to prevent leaks and ensure a secure seal.
Transmission, Differential, and Brake Fluids
The fluid requirements for the 2004 Jaguar S-Type extend beyond the engine bay. The automatic transmission, specifically the 6HP26 unit found in this model, requires a high-quality synthetic fluid to handle the stress of shifts and the heat generated during operation. For a complete fill, the 6-speed transmission requires 10 quarts of fluid. The Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is engineered to withstand heavy towing and elevated temperatures while remaining fluid in sub-zero conditions. It provides reserve protection during heavy use, ensuring the transmission shifts smoothly and efficiently for years to come.
For a value-oriented solution that still offers full synthetic protection, the OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is an excellent choice. It protects against wear and resists harmful sludge, promoting smooth, shudder-free shifts. Both the Signature and OE fluids are formulated to guard against leaks and ensure the transmission operates at peak efficiency, even in severe service environments.
The rear differential in this vehicle requires a heavy-duty 75W-140 100% Synthetic Gear Lube. The specification calls for a synthetic-based oil with a viscosity of 75W-140. The capacity for the rear differential is 2.7 pints. To meet this requirement, AMSOIL SEVERE GEAR 75W-140 100% Synthetic Gear Lube is the recommended fluid. This synthetic lube provides advanced protection against wear and controls thermal runaway, which is critical for maintaining the health of the gears. It also contains friction modifiers for limited-slip applications and protects against rust and corrosion, extending the life of the differential and seals.
DOT 3 and DOT 4 100% Synthetic Brake Fluid maintenance is essential for safety and system responsiveness. The Jaguar S-Type prefers a low viscosity, DOT 4 brake fluid that meets ISO 4925 Class 6 specifications. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is an ideal replacement. It offers excellent ABS and traction-control responsiveness, ensuring the vehicle stops safely and predictably. The fluid maintains a stable viscosity over a wide temperature range, which is vital for consistent braking performance in all weather conditions.
Cooling System and Fuel Care
Proper Passenger Car & Light Truck Antifreeze & Coolant management is vital for the longevity of the Jaguar’s engine. The cooling system capacity for the 3.0L engine is 9.9 quarts. Using the correct antifreeze ensures that the engine does not overheat in summer conditions or freeze in the winter. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a pre-mixed, 50/50 ethylene glycol formulation that offers protection for up to 150,000 miles or five years. It is phosphate, nitrate, nitrite, silicate, borate, and amine-free, making it safe for all cooling system metals, gaskets, and hoses while exceeding OEM requirements.
For those who prefer a concentrated antifreeze, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers a superior alternative. Requires mixing with distilled water, this formulation provides protection up to 150,000 miles in passenger cars and offers incredible longevity in heavy-duty applications. It greatly surpasses standards for metallic corrosion and erosion protection, ensuring the cooling system remains clean and efficient.
To keep the engine performing at its best, regular fuel system maintenance is necessary. The AMSOIL P.i. Performance Improver Gasoline Additive is a powerful solution for cleaning and protecting the fuel system. It restores up to 14% horsepower and brings GDI fuel injectors back to 100% flow rate after just one tank of fuel. By reducing the need for higher-octane fuel and preventing carbon buildup, this additive helps improve fuel economy and controls pre-ignition knock. For long-term storage, AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish, gum buildup, and ethanol corrosion.
About the Vehicle
The 2004 Jaguar S-Type represents a significant chapter in the brand’s history, blending British luxury with contemporary engineering. Part of the S-Type lineage introduced in 1999, this model was built on the Ford D2 platform, sharing its underpinnings with the Lincoln LS and Ford Taurus, though it was uniquely tuned for Jaguar’s specific ride and handling characteristics. The vehicle was available with several engine options, but the 3.0L AJ27 V6 engine described in this guide was a staple, offering a smooth and refined power delivery that appealed to drivers seeking a balance of performance and comfort.
Owners of the S-Type have long appreciated its distinctive styling, which features a sleek, curvaceous body design and an elegant interior that was ahead of its time in the early 2000s. The 3.0L V6 engine was known for its quiet operation and responsive throttle, making it a favorite for long-distance touring and daily driving alike. The S-Type was positioned as a mid-size luxury sedan, competing directly with the BMW 5 Series and Mercedes-Benz E-Class, offering a unique blend of British heritage and modern reliability.
As the vehicle ages, maintaining its original driving character becomes increasingly important. The 2004 model year sits in a sweet spot where the engineering is mature, yet the vehicle still offers a driving experience that modern entry-level luxury sedans often lack. Regular maintenance with high-quality lubricants ensures that the suspension components, steering, and braking systems remain precise, preserving the car’s renowned handling dynamics. Whether used as a classic weekend cruiser or a daily driver, the S-Type rewards careful owners with a sophisticated and engaging road presence. Keeping the fluids fresh is the key to unlocking its full potential and ensuring it continues to perform as a true luxury sports sedan.