2019 Harley-Davidson FLHX Street Glide — Maintenance & Ownership Guide
Routine Maintenance
Key maintenance tasks to keep your 2019 Harley-Davidson FLHX Street Glide running reliably.
Engine Oil
Service refill requires approx 4.75 quarts of 20W-50 oil. Standard interval is every 5,000 miles.
Primary Fluid
Requires approx 34 oz. Critical for clutch cooling and compensator lubrication.
Transmission Fluid
Requires approx 32 oz. Use dedicated gear lubricant or H-D Formula+.
Spark Plugs
Uses 10R12A plugs. Gap should be 0.031-0.035 in. Torque to 17 ft-lbs.
Common Wear Items
Parts that wear over time on the 2019 Harley-Davidson FLHX Street Glide and should be inspected regularly.
Brake Pads
Heavy touring bikes wear pads quickly; inspect every 2,500 miles. Front: 41854-08, Rear: 41852-08.
Tires
Rear tires often flat-spot or wear out by 8,000-12,000 miles due to weight and torque.
Battery
The high-compression M8 engine and infotainment draw heavily; standard battery is YIX30L (30Ah).
Popular Upgrades
The most popular aftermarket upgrades for the 2019 Harley-Davidson FLHX Street Glide.
Stage 1 Kit
Combination of high-flow air cleaner, slip-on mufflers, and an EFI tuner to improve sound and throttle response.
Oil Pump
Upgrading to the 2020+ H-D oil pump or S&S unit prevents potential 'sumping' issues in early M8 engines.
Rear Suspension
Stock 12-inch shocks have limited travel; many owners upgrade to 13-inch shocks (Ohlins, Legend) for better ride quality.
Common Replacement Parts
Parts that commonly need replacing on the 2019 Harley-Davidson FLHX Street Glide.
Air Filter
OEM Part 29400212. Paper element is washable but often replaced with high-flow units.
Used Buying Inspection Checklist
What to look for when buying a used 2019 Harley-Davidson FLHX Street Glide.
Primary Oil Level
Check for 'fluid transfer' where transmission oil migrates into the primary, causing overfilling of the primary and low levels in the trans.
Sumping Symptoms
Look for oil in the air cleaner or excessive heat/power loss after highway runs, indicative of a failing oil pump scavenge side.
Infotainment Functionality
Test the Boom! Box system for screen delamination or lag, especially if it hasn't been updated to the latest software.
Clutch Engagement
Early 2019 models may still have the hydraulic clutch issue where the clutch fails to disengage properly.
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