Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use. |
Multigrade
Engine lubricating oils which, by dint of additives, are less affected in viscosity by changes in temperature, are called Multigrade oils. They are designated by dual viscosity numbers, such as 10W/40, signifying that the viscosity at �18�C (�1�F) is comparable to that of a "strength" oil of SAE 10, and at 99 C (211�F) is comparable to a "strength" oil of SAE 40 grading. |
