Proper lubrication is the single most critical factor in maintaining the longevity and performance of your 1998 Mercedes-Benz E320. This vehicle, powered by the 3.2L inline-six engine, was engineered with precision tolerances that demand high-quality synthetic fluids to operate smoothly under various driving conditions. Using the correct oils and filters ensures that the engine, transmission, and cooling systems remain protected against wear, extreme temperatures, and the formation of sludge or corrosive deposits.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – A specialized formula designed for the unique demands of European gasoline and diesel vehicles, offering precise protection and enhanced performance.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – Provides superior cold-start protection and fluidity in extreme temperatures while maintaining a robust lubricating film at high heat.
- AMSOIL Oil Filter – Engineered for maximum efficiency, filtering out 99 percent of wear-causing contaminants at 20 microns to extend engine life.
- WIX Oil Filter – Offers premium media that improves upon original equipment manufacturer filters for better oil flow and contaminant capture.
- MANN-FILTERS Oil Filter – A high-quality OEM-replacement filter that ensures reliable engine protection and oil flow.
- MANN-FILTERS Air Filters – Premium media offers improvements over original equipment manufacturer filters.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation that protects against corrosion and extends service intervals up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that provides exceptional protection against metallic corrosion and erosion for up to 150,000 miles.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing, elevated temperatures, and the rigors of severe service while remaining fluid in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Delivers excellent protection against wear and sludge buildup with superior cold-weather performance.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Offers high-performance protection for a wide range of applications, ensuring smooth shifts and long fluid life.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Resists harmful sludge and promotes smooth, shudder-free shifts while guarding against leaks.
- 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 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction, keeps seals soft to prevent leaks, and provides strong anti-wear protection for long fluid life.
- AMSOIL P.i.® Performance Improver Gasoline Additive – Restores up to 14% horsepower and cleans GDI fuel injectors to 100% flow rate, improving fuel economy and preventing knock.
- AMSOIL Gasoline Stabilizer – Helps keep fuel fresh for up to 12 months, protecting against varnish, gum, and ethanol corrosion during storage.
Engine Oil and Filtration Recommendations
The heart of your 1998 Mercedes-Benz E320 is its 3.2L inline-six engine, specifically the engine code 112.94 7. This powerplant requires a lubricant that can handle the high operating temperatures and precise tolerances of German engineering. The engine oil capacity is 8.5 quarts when including the filter. For models equipped with an oil cooler, additional oil may be necessary if the cooler is drained. When topping off, it is important to allow approximately 5 minutes after refilling or turning the engine off before checking the oil level for an accurate reading. The oil drain plug should be torqued to 18 ft/lbs.
For optimal protection, AMSOIL offers two primary European-specific motor oils tailored for this vehicle. The AMSOIL 5W-40 FS is an excellent choice for year-round use, featuring a precise blend of synthetic base oils and premium additives designed for European vehicles. Alternatively, the AMSOIL 0W-40 FS provides superior cold-weather fluidity, making it ideal for owners facing extreme temperatures or those who prefer extended-service intervals. Both oils meet the rigorous demands of modern European engines and offer exceptional thermal stability.
Matching the oil with a high-quality filter is just as important as the oil itself. The AMSOIL Oil Filter (EA15K39) provides filtration efficiency of 99 percent at 20 microns, offering lower restriction and greater capacity for contaminants compared to many competing brands. This helps keep critical engine parts lubricated and reduces wear. For those preferring established aftermarket brands, the WIX Oil Filter (51226) and MANN-FILTERS Oil Filter (HU7185X) offer premium media that improves upon OEM standards, ensuring clean oil flows freely through the engine.
Transmission and Drivetrain Fluids
Maintenance of the transmission is vital for the smooth operation of this E320. The vehicle is equipped with a 722.6 automatic transmission, which requires a fluid capable of withstanding the stresses of shifting and heat generation. The total fill capacity for the 5-speed 722.6 transmission is 7.9 quarts. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is designed to withstand heavy towing and elevated temperatures, remaining fluid even in sub-zero conditions. It provides reserve protection during heavy use and abuse.
For a cost-effective option that still delivers top-tier protection, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid protects against wear and resists harmful sludge. It features excellent cold-weather performance and helps guard against leaks, promoting smooth, shudder-free shifts. The Multi-Vehicle options, including both the AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid and OE versions, offer versatile protection suitable for various driving conditions, ensuring the transmission fluid remains stable and effective over time.
The E320 also features a 4-Matic all-wheel-drive system. For the transfer case, the capacity is 2.1 pints, while the rear differential holds 2.7 pints. The AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid can be utilized for these components, providing the necessary lubrication to handle the rigors of 4-Matic operation. The OE Multi-Vehicle version is another robust choice that guards against leaks and promotes smooth operation, ensuring the drivetrain components remain well-lubricated and protected.
Cooling System and Fluids
The cooling system for the 1998 Mercedes-Benz E320 holds a capacity of 10.6 quarts of AMSOIL Passenger Car & Light Truck Antifreeze & Coolant. Maintaining the correct antifreeze mixture is crucial to prevent overheating and corrosion. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is an ethylene glycol 50/50 pre-mix that protects all cooling system metals, gaskets, and hoses. It is free of phosphates, nitrates, nitrites, silicates, borates, and amines, ensuring compatibility with the vehicle’s aging cooling components.
For those who prefer a concentrated fluid, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers flexibility. This concentrated formula requires mixing with distilled or high-quality water and provides protection up to 150,000 miles or 5 years in passenger cars and light trucks. It greatly surpasses standards for metallic corrosion and erosion, ensuring the cooling system remains clean and efficient.
Brake and Power Steering Fluids
Safety is paramount, and the braking system requires high-quality fluid to function correctly. The recommended fluid is DOT 4 plus or products approved on MB Sheet 331.0. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid offers excellent ABS and traction-control responsiveness, providing stable viscosity over a wide temperature range. This ensures consistent pedal feel and braking power in all weather conditions.
Similarly, the power steering system benefits from synthetic fluid. The AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid reduces friction and helps seals remain soft to prevent leaks. It resists heat for long fluid life and provides strong anti-wear protection. Formulated for quiet operation, this fluid ensures excellent high-temperature and low-temperature performance, keeping the steering responsive and silent.
About the Vehicle
The 1998 Mercedes-Benz E320 is a renowned luxury sedan that exemplifies the engineering excellence of the German automotive industry. Part of the W210 chassis generation, the E-Class is celebrated for its robust build quality, refined ride comfort, and sophisticated design. The E320 model specifically is powered by the M112 3.2-liter V6 engine, which replaced the earlier inline-six configurations in some markets but retained a reputation for smooth power delivery and reliable performance.
Owners of the E320 appreciate its balanced driving character, which combines the plush ride quality expected of a Mercedes-Benz with sufficient acceleration for confident merging and highway passing. The E-Class sedan typically offers a spacious interior, high-quality materials, and a suite of safety features that were ahead of their time. Whether used as a daily commuter or a long-distance cruiser, the E320 provides a sense of security and comfort that few other vehicles of its era could match. Its reputation for durability makes it a favorite among enthusiasts who value classic German engineering and a driving experience that remains relevant even decades after its release.