Diesel engine oil typically possesses a higher level of viscosity, which means it pumps at a much lower temperature and takes more heat to start flowing cleanly.

For the first time in many years, the American Petroleum Institute (API) introduced a split diesel engine oil classification to address the diverging needs of engines stemming from new on-highway ...

More than just lubricating internal parts, the right motor oil will help keep your diesel engine running cooler, quieter, and cleaner. Want the latest in tech and auto trends? Subscribe to our ...

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 ...