The Insight requires 2.5 Liters (2.5 bottles) for an oil change.
Why keep going back to buy oil on a regular basis?
I buy 12 liters at a time for convenience.
I buy the high quality "Made in Japan" Honda oil filters from #7 Honda in Woodbridge, north of Toronto.
Their price is 3 for $20 taxes included.
Normal price is $7.50 plus 15%tax each.
I would never use cheap oil filters.
You get what you pay for.