SAE Grade: 20W-50


It is premium quality low ash heavy-duty Gas Engine Oil suitable for highly rated spark ignition 4-stroke mobile engines requiring low ash level. It is a blend of specially selected high viscosity index base oils and carefully balanced performance additives.


It is specially designed for use in Mobile Gas Engines having slider follower. It is also suitable for use in Mobile Gas Engines having roller followers also.
MAK GEM 20W-50 has been approved by M/s Ashok Leyland for buses and commercial vehicles operating on CNG.
It is approved for Cummins B & C series engines. It also meets specifications for engines with slider followers.
It has been tested in a CNG engine with slider followers.
It meets the ash and TBN requirements of major OEMs.

Performance Benefits

  • Specifically designed to provide additional anti-wear protection to slider followers used in some of the mobile engines.
  • Consists of ash-containing and ash-less detergents – dispersants
  • Contains anti – oxidation, anti – wear and anti – corrosion additives
  • Good anti – foaming agents

Performance Level

  • API CF


 Characteristics  IS 1448 Typical Figures
Appearance —-  Clear & Bright
Colour, Visual Observation —- Brown
Density @15°C, gm/ml P:16 0.8884
K.V at 40° C, cSt P:25 19.3
Viscosity Index P:56 120
Flash Point, (COC), °C P:69 240
Pour Point, °C P:10 -21
Copper corrosion @ 100°C for 3 hrs. P:15 1a
Foaming Tendency / Stability: Qty. of foam in ml
a) Sequence I
b) Sequence II
c) Sequence III
P:67 Nil / Nil
10 / Nil
Nil / Nil


Health and Safety

These oils are not hazardous under normal conditions of use. For further guidance appropriate Material Safety Data Sheet may be referred.