Engine oils are made as per the standard specification for particular uses. Do we know that the specification does not indicate the performance of the engine oil?
We should know that many engine oils are claiming the same standard specification; however, those product doesn’t contain that.
Such poor quality products are available for reasons of our ignorance.
Unfortunately, good quality and poor quality engine oil both looks like same in physical sight. And it is very difficult to justify the oil quality at sight or practical uses.
The automakers recommended different engine oils based on the performance or viscosity grade. It is difficult for us to choose good performing oil analyzing those grades because different lube oil blenders follow the secret formulation to make oil.
The oil performance varies on the formulation and know-how experiences. The automotive and heavy-duty diesel industries are updating their trends.
Lubricant formulations are also changing to meet the main factors such as emission regulations, oil drain intervals, and fuel economy.