| Component | Specification |
|---|---|
| Production Years | 2010–Present |
| Engine Oil | SYN3 Synthetic 20W-50 (3.8 L) |
| Front Tire | 130/60B19 61H (36 psi) |
| Rear Tire | 180/55B18 80H (40 psi) |
| Battery | 66010-97D (AGM) / 66000303 (Lithium) |
| Spark Plugs | 31600085 (M8 117) / 31600106 (M8 121 VVT) |
Engineering Highlight: The Evolution of Custom Vehicle Operations
The Harley-Davidson CVO Street Glide (FLHXSE) represents the zenith of factory-customized performance. A unique engineering milestone for this model was the introduction of the Milwaukee-Eight® 121 VVT engine in recent iterations. This was the first time Harley-Davidson integrated Variable Valve Timing (VVT) into a Big Twin touring platform, effectively broadening the powerband and improving thermal efficiency without compromising the iconic exhaust note.
Technical Performance & Powertrain
At MotoSpecsLab, we categorize the FLHXSE as a high-performance touring machine. The transition from the Screamin’ Eagle 110 to the Milwaukee-Eight 117, and finally the 121 VVT, highlights a shift toward precision cooling and reduced vibration. The 121 VVT utilizes a single underslung radiator to manage head temperatures, ensuring consistent performance under heavy load.
Maintenance Guide: Fluids and Consumables
To maintain the structural and mechanical integrity of the FLHXSE, adherence to the following fluid specifications is mandatory:
- Engine Lubrication: Use only SYN3 Synthetic 20W-50. The system requires 3.8 Liters (approx. 4.0 US quarts) for a full change including the filter.
- Ignition System: For Milwaukee-Eight 117 variants, utilize plug 31600085. For the 121 VVT engines, the 31600106 plug is required to accommodate the specific combustion chamber geometry.
- Electrical System: Modern CVOs are increasingly equipped with the 66000303 Lithium LiFeP04 battery for weight reduction, though the 66010-97D AGM remains the standard for older models.
Chassis and Road Contact
Handling a 800lb+ machine requires precise tire maintenance. The FLHXSE utilizes a staggered 19-inch front and 18-inch rear wheel setup. Maintaining 36 psi (Front) and 40 psi (Rear) is critical for preventing cupping and ensuring the stability of the Reflex™ Linked Brembo® brakes with ABS.
Frequently Asked Questions (FAQ)
How often should I change the oil on my CVO Street Glide?
Under standard operating conditions, Harley-Davidson recommends an oil service every 5,000 miles (8,000 km). However, for CVO models operating in high-heat environments, a 3,000-mile interval is preferred by technicians to preserve the high-output valvetrain.
Can I use standard 20W-50 mineral oil?
While possible in emergencies, MotoSpecsLab strongly recommends SYN3 Synthetic. The high-performance nature of the CVO engines generates significantly more heat than standard trims, requiring the superior thermal stability of synthetic lubricants.
What is the benefit of the 121 VVT over the 117 engine?
The VVT (Variable Valve Timing) allows the engine to advance or retard camshaft timing, resulting in better low-end torque for passing and improved fuel economy at highway cruising speeds.