Here's why it varies:
* Different Models: Even within the same engine size (88ci), various Harley models like the Sportster, Dyna, Softail, and Touring have distinct engine designs and oil systems.
* Year of Manufacture: Engine designs and oil system components can change slightly between model years.
* Oil Filter Type: Some models might use different oil filters, which can impact the total oil capacity.
How to Find the Exact Oil Capacity:
1. Consult Your Owner's Manual: This is the most reliable source of information for your specific Harley model and year.
2. Check the Harley-Davidson Website: You can often find technical specifications for various models on the Harley-Davidson website.
3. Contact a Harley-Davidson Dealer: They can provide accurate information based on your motorcycle's VIN.
Important Note:
* Always use the recommended oil type and quantity specified by Harley-Davidson for your model.
* Overfilling or underfilling the oil can lead to engine damage.