Mitsubishi ECLIPSE Owner's Manual page 401

Vehicle care and maintenance
NOTE
Engine oil consumption is greatly influenced by payload,
engine speed, etc.
The engine oil will deteriorate rapidly if the vehicle is
subjected to severe conditions (for example, repeated
operation on rough roads, in mountainous regions, on
roads with many uphill and downhill gradients, or over
short distances). Consequently, the oil will require earlier
replacement in accordance with the schedule in the
"WARRANTY AND MAINTENANCE MANUAL".
Engine oil identification mark
Mitsubishi Motors recommends using only engine oils with the
ILSAC certification symbol on the front of the container.
ILSAC certification symbol
7
7-8
If you cannot find oils with the ILSAC certification symbol,
use an API classification SM or higher oil with the following
label.
This mark appears on the top of the oil container and tells you
two important things about the oil.
API service symbol
1- The top portion shows the quality of the oil.
2- The center portion shows the SAE grade of the oil viscosity.