Liqui Moly 20W-50 synthetic oil, specifically the "Motorbike 4T Synth 20W-50 Street" and "Motorbike HD Synth 20W-50 Street" is a fully synthetic engine oil designed for 4-stroke motorcycle engines, including those with or without a wet clutch. It is suitable for both air and water-cooled engines and is often recommended for Harley-Davidson V-Twin engines that require a 20W-50 viscosity oil.

Here's a breakdown of the specifications:

Viscosity: 20W-50. 

Type: Full synthetic. 

Suitable for: 4-stroke motorcycle engines, including those with or without a wet clutch. 

Engine types: Air and water-cooled, including Harley-Davidson V-Twin engines.

Specific Product Names: Motorbike 4T Synth 20W-50 Street, Motorbike HD Synth 20W-50 Street. 

Origin: Germany.

Approvals/Recommendations: API SN, ACEA A3, ACEA B4

Key Features: Provides reliable lubrication, optimum noise suppression and low wear together with perfect clutch function and smooth shifting. It also ensures excellent resistance to wear and thermal stress, optimum lubrication, excellent engine cleanliness and the best wear protection.