What is another word for forty weight?
Pronunciation: [fˈɔːti wˈe͡ɪt] (IPA) 
"Forty weight" is a term used in the automotive industry to describe a certain viscosity of motor oil. Some synonyms for "forty weight" include "10w-40," "SAE 10w-40," and "multigrade oil." These terms all refer to a motor oil that has a viscosity of 10 when cold and 40 when hot. Other motor oil viscosities include 5w-30, 20w-50, and 0w-20. It is important to use the correct viscosity of motor oil for your vehicle as recommended by the manufacturer. Choosing the wrong viscosity of oil can result in poor engine performance, increased wear and tear, and reduced fuel efficiency.
