2018 Harley-Davidson FLHTKL Ultra Limited Low — Maintenance & Ownership Guide
Routine Maintenance
Key maintenance tasks to keep your 2018 Harley-Davidson FLHTKL Ultra Limited Low running reliably.
Engine Oil
Requires approximately 4.5-5.0 quarts of 20W-50 synthetic oil; check level on the jiffy stand.
Primary & Transmission Fluid
Separate sumps; primary takes ~1 quart, transmission takes ~1 quart (80W-90 recommended for trans).
Spark Plugs
Uses 4 plugs (2 per cylinder); standard is Harley 6R10 or NGK CR9EIX; gap should be 0.031-0.035 in.
Common Wear Items
Parts that wear over time on the 2018 Harley-Davidson FLHTKL Ultra Limited Low and should be inspected regularly.
Brake Pads
Heavy touring bike wears through Brembo pads quickly, especially if the linked braking system is used heavily.
Rear Tire
The 180mm rear tire typically lasts 10k-15k miles depending on load and riding style.
Popular Upgrades
The most popular aftermarket upgrades for the 2018 Harley-Davidson FLHTKL Ultra Limited Low.
Suspension
The 'Low' model has very short travel (2.1 in rear); many owners upgrade to 13-inch shocks for better ride quality.
Ventilated Dipstick
Used to mitigate the transmission fluid transfer issue common in early M8 touring models.
Common Replacement Parts
Parts that commonly need replacing on the 2018 Harley-Davidson FLHTKL Ultra Limited Low.
Battery
High-compression 107 engine requires a strong 30Ah battery (YIX30L-BS) with at least 385 CCA.
Oil Pump
Early M8 engines (2017-2019) often benefit from the 2020+ updated oil pump to prevent sumping.
Used Buying Inspection Checklist
What to look for when buying a used 2018 Harley-Davidson FLHTKL Ultra Limited Low.
Verify if the 2018 clutch actuator recall (H-D Recall 0173) has been performed to prevent internal leaks.
Sumping Signs
Check the air cleaner for excessive oil residue, which can indicate a sumping issue in the M8 engine.
Transmission Fluid Level
Check both primary and transmission levels to ensure fluid isn't migrating between the two sumps.
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