Keeping a 1986 Ford Bronco II running smoothly requires more than just adding any fluid to the tank. This classic compact SUV, equipped with the 2.9L 6-cylinder engine (Engine Code [T] T), has specific lubrication needs that differ from modern vehicles. Using the correct viscosities and formulations ensures that the engine, transmission, and differentials are protected against wear, extreme temperatures, and the demands of off-road driving. AMSOIL synthetic lubricants provide a robust solution, offering superior protection and extended service intervals that conventional oils simply cannot match.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – The ultimate choice for maximum engine protection and performance, offering up to 25,000 miles of guaranteed protection between changes.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – A cost-effective synthetic option that provides 20,000 miles of protection while helping keep the engine running smoother and cleaner.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – Designed to outperform conventional oils with a 100% synthetic formulation that fights sludge and deposits effectively.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Specifically formulated for engines with over 75,000 miles, featuring enhanced anti-wear additives and a boosted detergent package.
- AMSOIL Oil Filter – Provides 99% filtering efficiency at 20 microns to keep engine parts lubricated and reduce wear.
- WIX Oil Filter – A premium OEM-branded filter alternative with improved media for superior filtration.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed ethylene glycol formulation that protects cooling system metals, gaskets, and hoses for up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formula that requires mixing, offering extended protection up to 150,000 miles or 5 years for passenger cars and light trucks.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Offers excellent cold-weather performance, guards against leaks, and promotes smooth, shudder-free shifts.
- AMSOIL Torque-Drive® 100% Synthetic Automatic Transmission Fluid – Provides long oil life by fighting thermal and oxidative degradation in automatic transmissions.
- WIX Transmission Filter – Features premium media for improved filtration over standard OEM filters to ensure transmission longevity.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Controls thermal runaway, protects against rust and corrosion, and contains friction modifiers for limited-slip differentials.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – An advanced gear lube that helps reduce operating temperatures and extends the life of seals and equipment.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – Offers superior protection against wear and controls thermal runaway for demanding gear applications.
- AMSOIL Super Shift® Racing Transmission Fluid – Resists extreme heat to virtually eliminate slippage, improving shift performance for power steering and transmission applications.
For the 1986 Ford Bronco II 2.9L 6-cylinder engine, a 5.0-quart capacity is required for an oil change when including the filter. The oil filter torque specification is 15-21 ft/lbs. When refilling, it is crucial to remove the dipstick to allow for adequate venting and proper oil flow into the crankcase. After the refill, always verify the oil level. AMSOIL Signature Series synthetic motor oils are designed to be more resistant to thermal breakdown and oxidation than conventional oils, which is particularly beneficial for the Bronco II when used for heavy towing, off-road use, or extreme temperatures. The high mileage variant includes a unique chemistry with boosted detergent and dispersant packages to clean out sludge and reduce wear in older engines.
The cooling system for the 1986 Bronco II has a capacity of 7.4 quarts when equipped with air conditioning and 7.9 quarts without. AMSOIL’s antifreeze and coolant products utilize a poly-organic acid (OAT) formulation that is compatible with all cooling system metals, gaskets, and hoses. These products are phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, ensuring compatibility with various other antifreeze colors while providing up to 150,000 miles of protection.
Transmission and Differential Lubrication
The Bronco II is equipped with a 4-speed A4LD automatic transmission. The initial fill capacity is 3 quarts. For total fills, a 4WD 4-speed A4LD requires 10 quarts, while the 4-speed RWD A4LD requires 9 quarts. AMSOIL Signature Series Multi-Vehicle and AMSOIL OE Multi-Vehicle synthetic automatic transmission fluids are formulated to withstand the rigors of heavy towing and challenging terrain. They remain fluid in sub-zero temperatures and provide reserve protection during heavy use. For those who prefer OE (Original Equipment) formulations, AMSOIL OE Multi-Vehicle and Fuel-Efficient transmission fluids offer comparable protection with features that resist harmful sludge and promote smooth, shudder-free shifts.
For manual transmissions, the Bronco II with the R1 5-speed transmission requires 3.6 pints of fluid. AMSOIL recommends using Signature Series or OE Multi-Vehicle automatic transmission fluids for this application as well, ensuring compatibility and performance across all gears. The WIX Transmission Filter is recommended to complement the fluid change, providing improved filtration over standard OEM filters.
Differential and Transfer Case Specifications
The transfer case in the Bronco II, such as the Warner 1350, requires 3 pints of lubricant. The drain plug torque specification is 14-22 ft/lbs, and the fill plug torque is the same. For the front and rear differentials, the Bronco II utilizes Dana 28 and Dana 35 units which require GL-5 rated gear lubes. The front Dana 28 differential holds 1.1 pints, while the front Dana 35 holds 3.6 pints. The rear differential capacity is 5.1 pints. All these components benefit from the extreme pressure additives found in AMSOIL SEVERE GEAR synthetic gear lubes. Whether you choose 80W-90, 75W-90, or 75W-110, these lubricants control thermal runaway, protect against rust and corrosion, and extend the life of the equipment. They also contain friction modifiers for limited-slip applications, ensuring smooth operation even under heavy loads.
Brake fluid is another critical component. The Bronco II requires Motorcraft High Performance DOT 3 brake fluid or an equivalent meeting Ford specification WSS-M6C65-A1. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides excellent ABS and traction-control responsiveness. It maintains a stable viscosity over a wide temperature range, ensuring consistent pedal feel and stopping power in all driving conditions. For power steering, AMSOIL suggests Super Shift Racing Transmission Fluid, which resists extreme heat and improves shift performance.
About the Vehicle
The 1986 Ford Bronco II stands as a nostalgic and capable chapter in the history of American compact SUVs. Based on the Ford Ranger platform, this vehicle was designed to offer the rugged utility and 4-wheel drive capability of its larger Bronco sibling in a smaller, more agile package. It was a popular choice for those who wanted off-road adventure without the massive size and fuel consumption of full-size trucks. The model year 1986 specifically featured the 2.9L V6 engine, which was Ford’s first V6 designed for the Ranger and Bronco II line. This engine code [T] T provided a balance of power and efficiency that was well-suited for both daily commuting and trail driving.
Owners of the 1986 Bronco II often appreciate its straightforward mechanical layout, which makes maintenance and repairs relatively accessible. The Bronco II was known for its solid 4-wheel drive system, capable of handling tough off-road terrain while still being nimble enough for city streets. The vehicle’s design prioritized durability, with a body-on-frame construction that contributed to its longevity. While it may not have the raw power of modern trucks, the Bronco II’s charm lies in its rugged simplicity and the sense of freedom it offers to those who enjoy exploring the outdoors. Its legacy as a compact 4×4 continues to attract enthusiasts who value its classic design and practical utility.
Maintaining this vehicle with high-quality synthetic fluids ensures that it remains as reliable today as it was when it left the factory. Whether you are restoring a classic or simply keeping a daily driver on the road, using the correct AMSOIL products will help preserve the engine’s performance, extend the life of the transmission, and keep the cooling and braking systems in top condition. The comprehensive range of lubricants available allows for a complete fluid change, ensuring that every moving part receives the protection it needs for years to come.