Read more: 10 Best Motor Oil Brands, Ranked The first major difference between diesel engine oil and conventional oil is the ...

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.

Additives in the oil were used to neutralize that acid ... We recommend selecting the best product for the diesel engine and the best option for the gasoline engines. Viscosity is paramount.” ...

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 ...