Am I Wasting Money ?

OC I have been riding a TVS Star City BS4 since 2016, covering 1.3 lakh kilometers over the past nine years. For every alternate service (i.e., every 8,000 kilometers), I have consistently used these specific set of products, including engine oil changes at 8,000 kilometers, instead of the 3,000-kilomneter interval recommended by the company. Despite this extended oil change interval, the engine still feels butter-smooth, runs cooler, and remains vibration-free up to 60 km/h. Additionally, the clutch is still factory-fitted, showing no significant signs of wear. Given this performance, I wonder: Was wasting money on these products, or are these small commuter bikes inherently this much reliable- even when using budget-friendly (~400rs) engine oils???