I use a lot of 20-50 oil in my old cars (up to 14qt per oil change), so I'm always on the lookout for deals. Autozone has a $2 of every quart of motorcycle and racing oil. That's $4.19 for valvoline 20W50 racing oil (higher ZDDP). Not quite as good as I've found in the past from Advance Auto, but it's still a $50 savings per car per season. Good for you guys with "M" cars as well.