Chrysler 20 and 30 HP Outboard Motors Service Manual OB 3435, Page 12Get this manual
Section
_ GENERAL SERVICE INFORMATION
MOTOR IDENTIFICATION
Figure shows the motor serial number and model number on an identification plate attached to the support plate on the starboard sideAlways indicate these numbers in all correspondence to properly identify the motor and to ensure that the correct parts are obtained when ordered
Use 85 Octane Minimum
1st preference 2nd preference 3rd preference Lead free Regular leaded Preminum leaded
Do Not Use
Low octane white gas Naptha or lamp gas Any fuel not intended for modern gasoline engine
Table 1Fuel UseSUPPORT PLATE (STARBOARD SI