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Harley-Davidson Heritage Classic (2010-2021) — Maintenance Specs

The Heritage Classic spans two platforms: the FLSTC Softail Classic (2010-2017, Twin Cam 103, leather saddlebags, windshield) and its replacement FLHC on the 2018+ Softail chassis with the Milwaukee-Eight 107 (114 in the FLHCS) and quick-detach bags. The official 2015 and 2019 owner's manuals document each generation's split personality in the spec sheet: oil jumps from 2.8 L to 4.73 L with the M8, the primary chaincase grows to 1.18 L, and the battery swaps from a 330 CCA unit to the 17.5 Ah/315 CCA Softail standard. Both keep 18.9 L tanks, 36/40 psi tire pressures, the 5,000-mile oil cadence and DOT 4 brake fluid every two years.

Quick specs

Oil capacity (with filter) 2.8 Loil tank with filter (3.0 US qt) - FLSTC, 2010-2017 Twin Cam 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Oil type Harley-Davidson H-D 360 (Screamin' Eagle SYN3 full synthetic acceptable) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Oil viscosity SAE 20W-50 (H-D 360 preferred; SYN3 acceptable) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Front tire pressure (solo) 36 psi248 kPa cold 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Rear tire pressure (solo) 40 psi276 kPa cold 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Spark plug H-D 6R12 (Twin Cam) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Spark plug gap 0.97-1.09 (TC) / 0.80-0.90 (M8) mm 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Fuel capacity 18.9 L5.0 US gal both generations 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)

Maintenance schedule

Specification Value Source
Engine oil & filter 1,000 mi first service, then every 5,000 mi (8,000 km) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Spark plug replacement every 30,000 mi (48,000 km) or 2 years 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Brake fluid change every 2 years 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)

Fluids & capacities

Specification Value Source
Oil capacity (with filter) 2.8 Loil tank with filter (3.0 US qt) - FLSTC, 2010-2017 Twin Cam 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Oil type Harley-Davidson H-D 360 (Screamin' Eagle SYN3 full synthetic acceptable) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Oil viscosity SAE 20W-50 (H-D 360 preferred; SYN3 acceptable) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Final drive oil transmission 0.95 L; primary chaincase 0.95 L (2010-2017) / 1.18 L (1.25 qt) 2018+ Lapproximate 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Brake fluid type (DOT) DOT 4 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Fuel capacity 18.9 L5.0 US gal both generations 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)

Torque specs

Specification Value Source
Spark plug 16.3-24.4 (TC) / 9.5-12.2 (M8) Nu00b7m 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)

Electrical

Specification Value Source
Battery 12V, 330 CCA sealed (2010-2017) / 12V 17.5 Ah 315 CCA (2018-2021) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Headlight bulb H4 60/55 W (2010-2017) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Spark plug H-D 6R12 (Twin Cam) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Spark plug gap 0.97-1.09 (TC) / 0.80-0.90 (M8) mm 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)

Tires & wheels

Specification Value Source
Front tire size MT90B16, Dunlop D402F (FLSTC) / 130/90B16, Dunlop D401F (FLHC 2018+) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Rear tire size 150/80B16, Dunlop D401 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Front tire pressure (solo) 36 psi248 kPa cold 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)
Rear tire pressure (solo) 40 psi276 kPa cold 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal)

Official manual

Owner's manual on Harley-Davidson official site

Opens the manufacturer’s official website in a new tab.

Frequently asked questions

How much oil does a Heritage Classic take?
2.8 L (3.0 qt) with filter on the 2010-2017 FLSTC Twin Cam; 4.73 L (5.0 qt) on the 2018+ FLHC Milwaukee-Eight.
What is the Heritage Classic tire pressure?
36 psi front and 40 psi rear (248/276 kPa) cold across both generations.
What oil does a Heritage Classic use?
H-D 360 SAE 20W-50 (SYN3 acceptable).
What battery does a Heritage Classic use?
330 CCA sealed on 2010-2017 models; 12V 17.5 Ah 315 CCA on 2018-2021.

Sources

Value Source Checked
Oil capacity (with filter): 2.8 L 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Oil type: Harley-Davidson H-D 360 (Screamin' Eagle SYN3 full synthetic acceptable) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Engine Lubrication, oil recommendation chart) 2026-11-03
Oil viscosity: SAE 20W-50 (H-D 360 preferred; SYN3 acceptable) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Final drive oil: transmission 0.95 L; primary chaincase 0.95 L (2010-2017) / 1.18 L (1.25 qt) 2018+ L 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Brake fluid type (DOT): DOT 4 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Fuel capacity: 18.9 L 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Engine oil & filter: 1,000 mi first service, then every 5,000 mi (8,000 km) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Spark plug replacement: every 30,000 mi (48,000 km) or 2 years 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Brake fluid change: every 2 years 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Spark plug: 16.3-24.4 (TC) / 9.5-12.2 (M8) Nu00b7m 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Battery: 12V, 330 CCA sealed (2010-2017) / 12V 17.5 Ah 315 CCA (2018-2021) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Headlight bulb: H4 60/55 W (2010-2017) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Spark plug: H-D 6R12 (Twin Cam) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Spark plug gap: 0.97-1.09 (TC) / 0.80-0.90 (M8) mm 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Front tire size: MT90B16, Dunlop D402F (FLSTC) / 130/90B16, Dunlop D401F (FLHC 2018+) 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Rear tire size: 150/80B16, Dunlop D401 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Front tire pressure (solo): 36 psi 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
Rear tire pressure (solo): 40 psi 2015 Harley-Davidson Owner's Manual: Softail Models, 99469-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 12) 2026-11-03
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