1.On the basis of Viscosity :

i. Lubricating Oils Classify in terms of Viscosity at -18 0C or in cold climates.

a) SAE 5W

b) SAE 10W

c) SAE 20 W

ii. Lubricating Oils Classify in terms of Viscosity at 99 0C or in hot climates.

a. SAE 20

b. SAE 30

c. SAE 40

d. SAE 50

e. Multi grade oils shown as SAE 20 W/50

2.On the basis of Service Rating :

i. C- series

a) CA: Use in gasoline and naturally aspirated diesel engine operated on low sulphur fuel.

b) CB: Use in gasoline, naturally aspirated diesel engine operated on high sulphur fuel.

c) CC: Use for lightly supercharge diesel engine.

d) CD: Use in highly turbocharger diesel engine.

ii. S- series

a. SA : Mineral oil , may contain anti-formant and poor point depressant

b. SB : Mineral oil , containing additive impart sum oxidation stability & anti- scuff

c. protection

d. SC, SD & SE: Meets automotive manufactures specifications.