2020 Harley-Davidson FLHX Street Glide — Maintenance & Ownership Guide
Routine Maintenance
Key maintenance tasks to keep your 2020 Harley-Davidson FLHX Street Glide running reliably.
Engine Oil
Requires ~4.5-5.0 quarts of 20W-50. Check hot on the jiffy stand to avoid overfilling, which causes oil carryover into the air cleaner.
Brake Fluid Flush
DOT 4 fluid must be flushed every 2 years regardless of mileage to prevent moisture-induced clumping in the ABS module.
Primary & Transmission
Primary takes ~38 oz; Transmission takes ~32 oz. Use dedicated lubricants like Formula+ or a high-quality synthetic 20W-50/75W-140.
Common Wear Items
Parts that wear over time on the 2020 Harley-Davidson FLHX Street Glide and should be inspected regularly.
Rear Tire
Heavy touring bikes wear rear tires quickly, typically between 8,000-12,000 miles depending on load and riding style.
Brake Pads
The 800+ lb weight places high demand on the Brembo pads; check thickness every 5,000 miles.
Popular Upgrades
The most popular aftermarket upgrades for the 2020 Harley-Davidson FLHX Street Glide.
Stage 1 Kit
Combining a high-flow air cleaner, slip-on mufflers, and an EFI tuner improves throttle response and reduces engine heat.
Windshield
The stock 4-inch 'wind deflector' provides minimal protection; many riders swap for a 6-8 inch recurve screen to reduce buffeting.
Audio
Stock speakers struggle at highway speeds. Rockford Fosgate Stage 2 or 3 kits are the most common plug-and-play upgrades.
Common Replacement Parts
Parts that commonly need replacing on the 2020 Harley-Davidson FLHX Street Glide.
Battery
High-compression V-twins require strong CCA (Cold Cranking Amps). OEM batteries typically last 3-4 years if not kept on a tender.
Spark Plugs
Dual-plug heads (4 plugs total). Replacement interval is 30,000 miles.
Used Buying Inspection Checklist
What to look for when buying a used 2020 Harley-Davidson FLHX Street Glide.
Brake Fluid Service Records
Verify the 2-year ABS flush was performed. Neglect leads to expensive ABS pump failure.
Oil Sumping Check
Though improved for 2020, check for signs of power loss or excessive heat after a long ride, which may indicate oil pooling in the crankcase.
Steering Head Bearings
Check for 'clunking' or notchiness in the front end, common if the 25,000-mile lubrication interval was missed.
Infotainment Screen
Test the Boom! Box GTS for flickering or blackouts, which can be caused by loose fairing connections or software bugs.
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