I change my oil on my 2012 Goldwing trike and when I put a full gallon back in it was still 1/2 quart low. Everyone tells me not to screw the dip stick in just put it down on the threads. I first I thought that I didn't give it enough time for the oil to drain back down. The dealership here in Enid told me to drive it a little and then let it set and check it. I did that and it was just touching the dip stick. I let set overnigh and it was still just touching the dip stick, so I added 1/2 quart and that put it up to full. The only thing that I can think of is that the gallon wasn't completely full. Has anyone else had this problem? Next time I may buy oil in quarts instead of the gallon.