or better yet, Change the oil each time you fill up.

 

Yeah, and make sure to flip the car over and shake it a bit, to get a few extra drops out from the fill tube. Don't want to mix the good stuff with the cheap stuff. Also consider running soapy water through it before refilling, to get the last little bit of old oil out.

 

you guys didnt tell them to use a funnel when adding in the new oil! now they will have oil in the intake!!!