Classification By Viscosity; Sae-Viscosity Table - Yanmar YSE8 Service Manual

(3) Air-tightening--k€eps the cylinder air-tight, prevents escape of compressed
air and operating gas.
(4) Cleaning--carries away carbon (combustion product) and intelnal dust.
(5) Rust prevention--keeps parts from rust.
Today, improved engines call for Ngh-quality lubdcating oils.
Oil companies
are now using a [umber of additives to improve the properties of their lubricaung oils.
5.2.2
Classification by viscositv
Lube oil viscosity should be so selected as to suit the ambient temperature.
SAE-Viscosity Table
t
I
F
SAE
No.
..
o'F ( 17.8"C)
I l0oF ta8 aoc)
Sayboli unive'sal Kinematic
viscosity. CSt
$ybotl uoiYersar
viscosiry. CSI
lo'c
5W
below 4,000 below 869
10w 6,000a-l 2,000
1,303a-2,606
20w
r 2,000b48,000 2,606b-10323
l 0
-2ec
20
45-58 513.9.62
30 58-70
9.62.t2.93
300c
40
7G85
t2.92-16.7'1
50
8 5 - 1 1 0 16.17.22.68
8