* Motul 7100 20W-50: This mineral-based oil is a good choice for motorcycles that are not used in harsh environments. It provides adequate engine protection and performance, and it is also relatively inexpensive.
* Honda GN4 10W-30: This is the oil that is recommended by Honda for the TMX 155. It is a semi-synthetic oil that provides good engine protection and performance.
* Castrol Power 1 Racing 4T 10W-50: This synthetic oil is designed for racing motorcycles. It provides excellent engine protection and performance, but it is also expensive.