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 solutionSpecial tools and equipment
Recommended service material
Note
required service material is also described in the following.
“Lubrication points”
Special tool
...
Iat sensor removal and installation
Removal
Remove the air cleaner box. Refer to “air cleaner box removal and
installation” in section 1d .
Remove the iat sensor (1) from the air cleaner box.
Installation
Install the iat sensor in the reverse order of removal.
Pay attention to the following point:
t ...
Fastener removal and installation
Type a
Removal
Depress the head of fastener center piece (1).
Pull out the fastener (2).
Installation
Let the center piece stick out toward the head so that
the pawls “a” closes.
Insert the fastener into the installation hole.
Note
to prevent the pawl ...