Lambretta DUE50 Owner's Manual page 49

CARE AND MAINTENANCE
CHECK ENGINE OIL
1. Use a Phillips screwdriver to remove oil tank cover located above the rear of the footpad.
2. Inspect the oil level. If it is near to the lower level, refill specific 2T engine oil to upper level.
NOTES:
Use 2T engine oil that meets API TC, JASO FC, NMMA, TC-W/ TCW II standards.
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See page 65 for recommended products.
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INSPECTION AND SERVICE SHOULD ALSO BE PERFORMED ANYTIME A MALFUNCTION
IS OBSERVED OR SUSPECTED.