Oil is light amber when you pour it into the engine ... the same viscosity and API service category, be assured that heavy-duty diesel engine oil brands and base oil types (conventional, synthetic ...

Goldman said it believes that a "suboptimal allocation" of the crude oil slate would lead to less U.S. and ex-U.S. refinery output of premium transportation fuels like gasoline and diesel.

In the past, there have been similar shifts in preferred engine oil viscosity grades. An example is the transition in heavy duty diesel engine oils in the 1980s from monograde viscosity SAE 30 and ...