2020 Harley-Davidson FLHRXS Road King Special — Maintenance & Ownership Guide
Routine Maintenance
Key maintenance tasks to keep your 2020 Harley-Davidson FLHRXS Road King Special running reliably.
Oil Service
Requires ~4.5-5.0 quarts of 20W-50 oil. Intervals are typically every 5,000 miles after the initial 1,000-mile break-in.
Primary & Transmission Fluid
Separate sumps; Primary takes ~34-38 oz (wet), Transmission takes ~32 oz. Use H-D Formula+ or equivalent.
Brake Fluid Flush
DOT 4 fluid must be flushed every 2 years regardless of mileage to prevent ABS module failure.
Common Wear Items
Parts that wear over time on the 2020 Harley-Davidson FLHRXS Road King Special and should be inspected regularly.
Tires
The 19-inch front and 18-inch rear Dunlop D408/D407 tires wear faster under heavy touring loads; expect 8k-12k miles on the rear.
Brake Pads
Heavy weight (800+ lbs) leads to moderate pad wear; Brembo pads are standard and provide excellent bite but produce dust.
Battery
Requires a high-CCA battery (YIX30L type). M8 engines are sensitive to low voltage during startup.
Popular Upgrades
The most popular aftermarket upgrades for the 2020 Harley-Davidson FLHRXS Road King Special.
Stage 1 Kit
High-flow air cleaner, slip-on mufflers, and a tuner are standard first upgrades to improve sound and heat management.
Windshield
The Special comes without a windshield; most owners add a quick-detach unit for long-distance comfort.
LED Lighting
While it has a large halogen headlight, many upgrade to the Daymaker LED for significantly better night visibility.
Common Replacement Parts
Parts that commonly need replacing on the 2020 Harley-Davidson FLHRXS Road King Special.
Shift Linkage
Stock H-D shift linkages use thin ball joints that can snap; many owners replace with a solid aftermarket linkage.
Exhaust Gaskets
Often replaced when upgrading to Stage 1 exhaust systems to prevent leaks at the head.
Used Buying Inspection Checklist
What to look for when buying a used 2020 Harley-Davidson FLHRXS Road King Special.
Primary Venting
Check if the primary vent (H-D service kit) was installed to prevent 'fluid transfer' from the transmission to the primary.
Oil Pump Version
2020 models received the updated 8-tooth scavenger gear oil pump which mostly fixed 'sumping' issues found in 2017-2019 models.
RDRS Functionality
If equipped with the optional RDRS, verify no dash codes for Traction Control or TPMS sensors.
Saddlebag Mounts
Inspect the quarter-turn fasteners inside the bags; they can vibrate loose if not properly seated.
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