I used to have an old camry with over 240k miles on it. It would burn a quart of oil about every 500 miles or so like clockwork. Since it burned so much I would just buy the cheapest 10w30 I could find, it didn't matter what brand. I had another toyota that took 5w20 and required 4.5 quarts, so that leftover half a quart of 5w20 pennzoil platinum would go in the camry too. On top of that, I worked at a dealership detailing cars and would often find spare quarts of oil in the trunks of trade ins, those would go in the camry no matter what brand or weight of oil they were. If I was at a friend or family member's house and saw a dusty old quart of oil from the 80's in their garage I would ask them if I could have it and it would go in the camry no matter what it was. I was so broke I would even put in various oil additives I found in trade ins at the dealer (like restore or marvel mystery oil). Nothing ever changed how it ran, or how much oil it burned. I'm not saying it's ideal or it didn't hurt anything, but I did this for a couple years and it didn't seem to effect anything at all as far as I could tell. I certainly wouldn't advise putting the wrong weight of oil in a car, but I'm just telling you what my experience was.