I did an oil change on my sister's van today and used a 5 quart jug of Quaker State 5W-20 that I got from Meijer to go along with another quart of QS 5W-20 to use. I went to open the jug and realized that the tamper seal didn't break when I opened it... it was already broken open. Someone likely opened it to get the code out of it to use for the Shell Fuel Rewards. I didn't feel like going all the way back to the store, but it was unnerving and frustrating. Has anyone else encountered this? The oil was fresh/new, so it doesn't seem like someone just returned used oil and the store put it back on the shelf. In retrospect, I really should have returned it but I didn't have the receipt since I bought it a few weeks ago and I was also crunched for time. Who knows what someone could've put in there.