How to Select the Right Engine Oil

Correct viscosity (SAE classification)

The engine must start at temperatures way below freezing and oil must reliably lubricate the engine also at high temperatures and under heavy loads. In winter, using an engine block heater raises the oil temperature only by a couple of degrees, so the oil must be selected according to the outside temperature unless a special oil heater is used.

Correct performance (API and/or ACEA classifications as well as specifications by engine manufacturers)

The quality of oil affects the oil change interval. The properties of high quality engine oil last longer and enable the long oil change intervals recommended by the car manufacturer. Car manufacturers declare the minimum requirements for engine oil as well as viscosity classes in the owner’s manual of the vehicle.

SAE Classification for Engine Oils







SAE Class

Viscosity, cP

Pumpability temperature

Viscosity, cSt at 100 оС

Viscosity, cSt at 100 оС

HSHT viscosity, 150 оС 1061/s

 

Max.

Max.

Min.

Max.

 

0w
5w
10w
15w
20w
25w

6200 / -35 оС
6600 / -30оС
7000 / -25оС
7000 / -20оС
9500 / -15оС
13000 / -10 оС

-40 оС
-35 оС
-30 оС
-25 оС
-20 оС
-15 оС

3.8
3.8
4.1
5.6
5.6
9.3

-
-
-
-
-
-

-
-
-
-
-
-

20
30
40
50
60

-
-
-
-
-

-
-
-
-
-

5.6
9.3
12.5
16.3
21.9

9.3
12.5
16.3
21.9
26.1

2.6
2.9
2.9-3.7*
3.7
3.7

 

*2.9 (0w/40=, 5w/40, 10w/40)

3.7 (15w/40, 20w/40, 25w/40, 40)