How much oil??

It's because the don't sell 1/2 quarts of oil.( well maybe at lawn mower shops)
We had a lady with a 80's Dodge that we did oil changes for. She would bring her own oil.4 1/2 quarts
She told us, that's what is in the owners manual. She supplies her own because she didn't want to be charged for 5 quarts. Either way your ok. 1/2 quart over won't hurt a daily driver.