MolaKule
Staff member
An SAE paper in 1991, (910742) was entitled,
"Direct Observation of the Friction Reduction of Multigrade Lubricants"
by some people at MIT.
Using laser fluorescence and other methods, they measured lubricant film thickness
of the top piston ring in a running engine using 5 dino oils; two single grade, and three multi-grades.
The engine was a small IDI diesel.
The report said that multi-grades had lower friction than straight-grades by about 20% for the top ring .
"Direct Observation of the Friction Reduction of Multigrade Lubricants"
by some people at MIT.
Using laser fluorescence and other methods, they measured lubricant film thickness
of the top piston ring in a running engine using 5 dino oils; two single grade, and three multi-grades.
The engine was a small IDI diesel.
The report said that multi-grades had lower friction than straight-grades by about 20% for the top ring .