2015 Harley-Davidson FLHTKL Ultra Limited Low — Maintenance & Ownership Guide
Routine Maintenance
Key maintenance tasks to keep your 2015 Harley-Davidson FLHTKL Ultra Limited Low running reliably.
Engine Oil
Requires 4.0 quarts of 20W-50 motorcycle oil; synthetic is preferred for the Twin-Cooled engine due to high operating temperatures.
Coolant Flush
The Twin-Cooled system uses a specific Harley-Davidson coolant; air pockets in the system can lead to water pump failure.
Common Wear Items
Parts that wear over time on the 2015 Harley-Davidson FLHTKL Ultra Limited Low and should be inspected regularly.
Wheel Bearings
Rushmore-era touring bikes are known for premature wheel bearing failure; check for play or noise every tire change.
Brake Pads
Reflex Linked Brakes apply both front and rear; rear pads often wear faster than expected due to the linked system logic.
Popular Upgrades
The most popular aftermarket upgrades for the 2015 Harley-Davidson FLHTKL Ultra Limited Low.
Heated Grips
Since the FLHTKL removed heated grips for the smaller diameter, many owners add them back using accessory kits.
Rear Suspension
The lowered 12-inch shocks have limited travel; upgrading to premium 13-inch shocks (standard height) significantly improves ride quality.
Common Replacement Parts
Parts that commonly need replacing on the 2015 Harley-Davidson FLHTKL Ultra Limited Low.
Electric Water Pump
The original Bosch-style pump is prone to circuit board failure; many owners replace it with the updated 2017+ style pump kit.
Saddlebag Pins
The original 1/4-turn pins were recalled; many owners replace them with threaded safety bolts to prevent bag loss.
Used Buying Inspection Checklist
What to look for when buying a used 2015 Harley-Davidson FLHTKL Ultra Limited Low.
Coolant Pump Operation
Turn the ignition on and roll the throttle halfway for 3 seconds to trigger the pump and fans; listen for a grinding or non-functional pump.
Clutch Master Cylinder Recall
Verify if the 2015 clutch recall was performed; a failing cylinder can cause the bike to 'creep' in gear with the lever pulled.
Saddlebag Mounting Receptacles
Check if the mounting pins are the updated version or if they have been replaced with safety bolts.
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