I've had my 2008 4runner for about 5 years and I've put on about 100k miles. It's almost at 200k right now. I always do the oil changes myself every 5k miles. I usually dump the old oil in a empty windshield washer jug. Today I changed my oil but I had to dump the old oil into the old quart containers. To my surprise I was only able to fill about 3 bottles.I know there's some oil left in the filter and some that drips out when the filter gets removed, but 2 quarts short seems very concerning.