Question

question 3
the viscosity of engine oil is found where?
factory service manual or service information
owners manual
lubrication guide
all of these

Explanation:

The viscosity of engine - oil can be found in the factory service manual or service information which contains technical details about the vehicle's components. The owners manual also provides general information about vehicle maintenance including oil - related details. A lubrication guide specifically focuses on lubrication aspects like oil viscosity. So all these sources can provide information on engine - oil viscosity.

Answer:

D. All of these