Iron Stable

Harley-Davidson FAT BOY Oils & Fluids

Genuine HD oils & fluids and aftermarket alternatives that fit the FAT BOY — all years. Select your year for exact fitment and pricing.

Select your year for exact fitment & prices

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Genuine Harley-Davidson (13)

Harley-Davidson Genuine H-D 360 Motorcycle Oil is developed and tested for use in Harley-Davidson motorcycles. Its unique additive package helps prevent engine wear and helps keep your engine cooler, cleaner, and free of sludge, varnish and corrosion. 4 Litres.

Genuine Harley-Davidson

Harley-Davidson Genuine H-D 360 Motorcycle Oil is developed and tested for use in Harley-Davidson motorcycles. Its unique additive package helps prevent engine wear and helps keep your engine cooler, cleaner, and free of sludge, varnish and corrosion. 4 Litres.

62600042B
Iron Pass £46.80£55.06View
Engine Brightner Cleaner

Genuine Harley-Davidson

Engine Brightner Cleaner

93600068
Iron Pass £18.67£21.96View
Formulated for the high-performing Revolution engine, this antifreeze is pre-diluted with deionized water to eliminate cooling system contamination. - 1 Gallon (3.78 Liter)

Genuine Harley-Davidson

Formulated for the high-performing Revolution engine, this antifreeze is pre-diluted with deionized water to eliminate cooling system contamination. - 1 Gallon (3.78 Liter)

99822-02A
Iron Pass £26.40£31.06View
Original Harley-Davidson DOT 4 Platinum Brake Fluid. - DOT 4 Brake Fluid - 12 oz bottle (355 ml) - Replaces H-D 99953-99A & 41800219

Genuine Harley-Davidson

Original Harley-Davidson DOT 4 Platinum Brake Fluid. - DOT 4 Brake Fluid - 12 oz bottle (355 ml) - Replaces H-D 99953-99A & 41800219

41800773
Iron Pass £8.76£10.31View
Tested and certified for use in Harley-Davidson engine, primary chaincase and transmission applications, Screamin' Eagle SYN3 Full Synthetic Lubricant makes changing and topping off fluids a simple, one-product process. 1 Litre. Synthetic SAE 15W50 (compatible with models that use 20W50 oil). Developed with a proprietary three-synthetic basestock formula, Screamin' Eagle SYN3 Lubricant is formulated to provide long-term protection and engine cleanliness, and superior high-temperature protection for high-output engines. It maintains the coefficient of friction for proper clutch operation and provides the proper lubrication to the primary chain drive. In addition, it is designed to provide the correct lubricity for the anti-wear requirements of transmission gears and for improved seal protection. This formula is approved by Harley-Davidson for use in all stages of engine life and is not detrimental to the break-in stage of engines. Replaces H-D 62600015.

Genuine Harley-Davidson

Tested and certified for use in Harley-Davidson engine, primary chaincase and transmission applications, Screamin' Eagle SYN3 Full Synthetic Lubricant makes changing and topping off fluids a simple, one-product process. 1 Litre. Synthetic SAE 15W50 (compatible with models that use 20W50 oil). Developed with a proprietary three-synthetic basestock formula, Screamin' Eagle SYN3 Lubricant is formulated to provide long-term protection and engine cleanliness, and superior high-temperature protection for high-output engines. It maintains the coefficient of friction for proper clutch operation and provides the proper lubrication to the primary chain drive. In addition, it is designed to provide the correct lubricity for the anti-wear requirements of transmission gears and for improved seal protection. This formula is approved by Harley-Davidson for use in all stages of engine life and is not detrimental to the break-in stage of engines. Replaces H-D 62600015.

62600153
Iron Pass £17.81£20.95View
Harley-Davidson Genuine H-D 360 Motorcycle Oil is developed and tested for use in Harley-Davidson motorcycles. Its unique additive package helps prevent engine wear and helps keep your engine cooler, cleaner, and free of sludge, varnish and corrosion. 1 Litre. Replaces H-D 50W Oil 99816-50/EULT.

Genuine Harley-Davidson

Harley-Davidson Genuine H-D 360 Motorcycle Oil is developed and tested for use in Harley-Davidson motorcycles. Its unique additive package helps prevent engine wear and helps keep your engine cooler, cleaner, and free of sludge, varnish and corrosion. 1 Litre. Replaces H-D 50W Oil 99816-50/EULT.

62600018
Iron Pass £10.68£12.56View
H-D Ethanol Guard Fuel Stabilizer

Genuine Harley-Davidson

H-D Ethanol Guard Fuel Stabilizer

91600001
Iron Pass £8.16£9.60View
Harley-Davidson Genuine H-D 360 Motorcycle Oil is developed and tested for use in Harley-Davidson motorcycles. Its unique additive package helps prevent engine wear and helps keep your engine cooler, cleaner, and free of sludge, varnish and corrosion. Harley-Davidson air-cooled V-Twin motorcycles operate at higher temperatures than water-cooled engines, so a specific high-temperature additive package is necessary to protect the engine.

Genuine Harley-Davidson

Harley-Davidson Genuine H-D 360 Motorcycle Oil is developed and tested for use in Harley-Davidson motorcycles. Its unique additive package helps prevent engine wear and helps keep your engine cooler, cleaner, and free of sludge, varnish and corrosion. Harley-Davidson air-cooled V-Twin motorcycles operate at higher temperatures than water-cooled engines, so a specific high-temperature additive package is necessary to protect the engine.

62600017
Iron Pass £10.68£12.56View
The original H-D Screamin' Eagle Performance fork oil is a thicker oil for improved damping in demanding applications. If your fork is too soft, changing the oil is the easiest way to remedy the situation. 473 ml bottle (16 oz). Viscosity: heavy. Please refer to the manual for filling quantity.

Genuine Harley-Davidson

The original H-D Screamin' Eagle Performance fork oil is a thicker oil for improved damping in demanding applications. If your fork is too soft, changing the oil is the easiest way to remedy the situation. 473 ml bottle (16 oz). Viscosity: heavy. Please refer to the manual for filling quantity.

62600027
Iron Pass £9.12£10.73View
Genuine SYN Blend Motorcycle Oil is a formulation engineered by Harley-Davidson and factory tested for optimal performance. This oil blends premium base stocks with premium Harley-Davidson proprietary additives for optimized durability, minimal friction loss, and a wide ambient operating temperature range. - Superior durability for engine components over a wide operating range and temperature - Supports tighter engine tolerances in colder temperatures - Formulated for optimal clutch, engine, and transmission performance - Facilitates long life of emission components, including exhaust catalysts - 1 Liter

Genuine Harley-Davidson

Genuine SYN Blend Motorcycle Oil is a formulation engineered by Harley-Davidson and factory tested for optimal performance. This oil blends premium base stocks with premium Harley-Davidson proprietary additives for optimized durability, minimal friction loss, and a wide ambient operating temperature range. - Superior durability for engine components over a wide operating range and temperature - Supports tighter engine tolerances in colder temperatures - Formulated for optimal clutch, engine, and transmission performance - Facilitates long life of emission components, including exhaust catalysts - 1 Liter

62600101
Iron Pass £14.21£16.72View
H-D Type E Fork Oil

Genuine Harley-Davidson

H-D Type E Fork Oil

62600026
Iron Pass £11.22£13.20View
TESTED-CERTIFIED for use in Harley-Davidson transmission and primary chaincase applications. Exclusively engineered for Harley-Davidson Motorcycles, this Heavy Synthetic Gear Oil is intended for use in extreme temperature environments (desert heat or cold weather), frequent two-up riding and heavy load riding applications. This dual viscosity (SAE 80W-140) heavy weight gear and primary oil was developed with proprietary additives and a pure synthetic base stock, so it flows better at cold start-up and in high temperatures behaves like a 140 weight oil to provide maximum protection. - Formulated to maintain the proper coefficient of friction for clutch operation and provide superior lubrication for the primary chain drive - Provides specialized lubricity for the anti-wear requirements of transmission gears across a wider temperature range than mineral based oil - Approved by Harley-Davidson for use in all stages of transmission and primary chaincase life - Not for use in the crankcase as a motor oil - 1 Liter - US OEM # 62600091

Genuine Harley-Davidson

TESTED-CERTIFIED for use in Harley-Davidson transmission and primary chaincase applications. Exclusively engineered for Harley-Davidson Motorcycles, this Heavy Synthetic Gear Oil is intended for use in extreme temperature environments (desert heat or cold weather), frequent two-up riding and heavy load riding applications. This dual viscosity (SAE 80W-140) heavy weight gear and primary oil was developed with proprietary additives and a pure synthetic base stock, so it flows better at cold start-up and in high temperatures behaves like a 140 weight oil to provide maximum protection. - Formulated to maintain the proper coefficient of friction for clutch operation and provide superior lubrication for the primary chain drive - Provides specialized lubricity for the anti-wear requirements of transmission gears across a wider temperature range than mineral based oil - Approved by Harley-Davidson for use in all stages of transmission and primary chaincase life - Not for use in the crankcase as a motor oil - 1 Liter - US OEM # 62600091

62600093
Iron Pass £22.36£26.30View
H-D Type B Fork Oil

Genuine Harley-Davidson

H-D Type B Fork Oil

62600025
Iron Pass £11.22£13.20View

Aftermarket alternatives

Aftermarket oils & fluids that fit the FAT BOY. Genuine Harley-Davidson is listed above, not here.

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