2018 Harley-Davidson FLTRXS Road Glide Special — Common Issues & Known Problems
Known Issues & Owner Reports
These are the most commonly reported issues and concerns from owners, mechanics, and community forums for the 2018 Harley-Davidson FLTRXS Road Glide Special.
Oil Sumping
HighExcess oil accumulates in the crankcase during high-RPM or heavy-load riding, causing power loss and potential engine damage.
Oil Transfer (Migration)
MediumTransmission fluid migrates through the hollow main shaft into the primary case, leaving the transmission dangerously low.
Hydraulic Clutch Actuator Leak
HighInternal seal failure in the secondary actuator can lead to a loss of clutch disengagement.
Excessive Engine Heat
LowFactory lean tuning for emissions causes the rear cylinder to run very hot, especially in stop-and-go traffic.
Used Buying Inspection Checklist
What to look for when buying a used 2018 Harley-Davidson FLTRXS Road Glide Special.
Transmission Oil Level
If the dipstick is dry but the primary is overfilled, the bike has the 'oil transfer' issue.
Air Cleaner Housing
Check for excessive oil pooling inside the air cleaner, which is a primary symptom of engine sumping.
Clutch Recall (0173)
Verify if the secondary clutch actuator has been replaced; the original part was prone to internal leaks.
Grey Sludge in Primary
When checking the primary oil, a grey/foamy appearance indicates transmission fluid mixing with primary oil.
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