Thanks for the helpful tip Ray O. I think what I'll do is buy the big 5-quart jug since it's cheaper by the unit, and pour it into the four empty 1-quart bottles that I still have saved from 6 months ago. I'll give the tech the 4 1-quart bottles, and keep the jug at home.
There isn't any concern about contamination or anything like that by re-filling and re-using the old bottles, is there?
And this way I can control exactly how much oil is added. The first tech put in 4.25 quarts, and the second tech put in 4.5 quarts.