Take a look at this new class action settlement that is live right now for anyone who bought XCEL premium motor oil between Dec. 1, 2014, and Oct. 11, 2019. There is no proof of purchase required to claim what is owed to you. This means you wont need to go digging through old receipts. The deadline for signing up for this settlement is 2/12/20. Claim up to $6+ ($2 per quart, up to 3 bottles for a total of $6 with no proof of purchase OR $5 per quart with proof of purchase).
Some other Class Action Settlements that are still available: