2019 Harley-Davidson FLHTKL Ultra Limited Low — Maintenance & Ownership Guide
Routine Maintenance
Key maintenance tasks to keep your 2019 Harley-Davidson FLHTKL Ultra Limited Low running reliably.
Engine Oil
Requires ~5.0 quarts of 20W-50 motorcycle oil. Intervals are every 5,000 miles after the initial 1,000-mile break-in service.
Brake Fluid Flush
DOT 4 fluid must be flushed every 2 years regardless of mileage to prevent moisture buildup in the ABS module.
Primary & Transmission Fluids
Primary requires ~38-45 oz; Transmission requires ~28-32 oz. Critical to monitor levels due to known fluid transfer issues.
Common Wear Items
Parts that wear over time on the 2019 Harley-Davidson FLHTKL Ultra Limited Low and should be inspected regularly.
Tires
The heavy weight (900+ lbs) causes rapid wear, typically 10k-15k miles for the rear Dunlop Multi-Tread.
Brake Pads
Brembo pads provide excellent stopping power but can wear quickly under heavy touring loads; check thickness every 5k miles.
Battery
The high-compression 114 engine and extensive electronics (GTS system, heated grips) demand a healthy AGM battery; life expectancy is 3-4 years.
Popular Upgrades
The most popular aftermarket upgrades for the 2019 Harley-Davidson FLHTKL Ultra Limited Low.
Vented Dipstick
Reduces crankcase pressure, which is a contributing factor to oil sumping in early M8 engines.
Stage 1 Air/Exhaust
Improves airflow and provides the traditional Harley sound; often paired with a tuner to manage heat.
Common Replacement Parts
Parts that commonly need replacing on the 2019 Harley-Davidson FLHTKL Ultra Limited Low.
Oil Pump
Owners often replace the 2019-spec oil pump with the updated 2020+ version (OEM P/N 62400247) to prevent sumping.
Primary Vent Kit
A common fix for 'fluid transfer' where transmission oil migrates into the primary; Harley released a service kit for this.
Used Buying Inspection Checklist
What to look for when buying a used 2019 Harley-Davidson FLHTKL Ultra Limited Low.
Transmission Oil Level
Check if the transmission oil is low while the primary is overfull; this indicates the 'oil transfer' issue.
Air Cleaner Housing
Look for excessive oil residue inside the air cleaner, which can be a sign of sumping or high crankcase pressure.
Infotainment Boot Time
Ensure the Boom! Box GTS system boots within ~10 seconds; slow performance can indicate software or hardware issues.
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