No, not all engine oils can be used in both types of engines. Each type of engine has specific requirements, although some oils, like the one described, are formulated to be versatile enough to be used in both gasoline and diesel engines.

High-Temperature High-Shear (HTHS) viscosity measures the oil's performance under severe operating conditions like high temperatures and high shear rates. Oils with appropriate HTHS viscosities offer better protection against wear and tear in extreme conditions.

Low viscosity oils improve fuel economy and reduce internal engine friction, making them particularly advantageous for modern engines designed for efficiency.

The A5/B5 specification is focused on oils designed for use in engines that require low-viscosity oils with High-Temperature High-Shear (HTHS) viscosities between 2.9 to 3.5 mPa*s. These oils generally provide better fuel economy and are suitable for both gasoline and diesel engines.

Volvo 5-cylinder engines are generally known for their durability and performance, but they may have specific requirements in terms of viscosity and additives to function optimally, which is why a specialized oil has been developed for them.

Full synthetic engine oils offer better high-temperature stability, lower levels of impurities, and superior mechanical properties, which results in longer engine life and better performance in extreme conditions compared to conventional oils.