Oil quality is a major contributor to your engine's performance and life. Always select good quality engine oil. Suzuki recommends the use of suzuki performance 4 motor oil or equivalent engine oil. Use sf/sg or sh/ sj with jaso ma in api (american petroleum institute) classification.

Api: american petroleum institute jaso: japanese automobile standards organization
Sae engine 011 viscosity
Suzuki recommends the use of sae 1 ow-40 engine oil. If sae 10w-40 engine oil is not available, select an alternative according to the following chart.

Jaso T903
The jaso t903 standard is an index to select engine oils for 4- stroke motorcycle and atv engines. Motorcycle and atv engines lubricate clutch and transmission gears with engine oil. Jaso t903 specifies performance requ irements for motorcycle and atv clutches and transmission.
There are two classes, ma and mb. The oil container has following classification for confirming the standard.

Energy conserving
Suzuki does not recommend the use of "energy conserving" oi ls. Some engine oils which is api sh or greater has "energy conserving" indication in api classification doughnut mark.
These oils can affect engine life and clutch performance.
Fuel
Engine coolant solutionBalancer shaft disassembly and assembly
Refer to “engine bottom side disassembly” (page 1d-
49).
Refer to “engine bottom side assembly” .
Disassembly
Remove the balancer shaft. Refer to “engine bottom side disassembly” .
Remove the washers, balancer gear and dampers
from the shaft.
Assembly
Assembly is in the re ...
Lubrication points
Proper lubrication is important for smooth operation and long life of each
working part of the motorcycle.
Major lubrication points are indicated as follows.
Note
before lubricating each part, clean off any rusty spots
and wipe off any grease, oil, dirt or grime.
&nbs ...
Engine coolant temperature indicator light inspection
Inspect the engine coolant temperature meter and indicator light (led) in the
following procedures:
remove the left side cowling. Refer to “exterior parts removal and
installation” in section 9d .
Disconnect the ect sensor coupler (1).
Connect a variable resistor (2) ...