Mobil has a rebate deal going this month. I picked up a 5 liter bottle of Mobil 1 0W-40 European Formula (approved by Audi) from Walmart for $22. Plus there's a $12 rebate so my final cost was $10 and change. Not bad for a big bottle!
https://apfco.net/secure/R8235W/Home/Intro
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