Selection of Lubricating Oil:
1. On the basis of Viscosity :
Lubricating Oils Classify in terms of Viscosity at -180C or in cold climates.
a) SAE 5W
b) SAE 10W
c) SAE 20 W
Lubricating Oils Classify in terms of Viscosity at 990C or in hot climates.
a) SAE 20
b) SAE 30
c) SAE 40
d) SAE 50
2. On the basis of Service Rating :
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 turbo-charge diesel engine.
S- series
a) SA : Mineral oil , may contain anti-formant and poor point de-present
b) SB: Mineral oil , containing additive impart sum oxidation stability & anti- scuff
Protection
c) SC, SD & SC: Meets automotive manufactures specifications.