[Perfectlap]

I did the same, (Filter and wrench from Ebay) and I'll pick up two cases of Mobil1 from CostCo. My local mecahnic will do it for $10.
Those oil change places seem to like employ high school workers who don't tighten my oil cap completely so that when I drive away the cap comes off and my engine bay is full oil. Or on another ocassion they left a wrench under the hood, then there's the time two oil caps ended up in hood, etc.