Just had a tank that was 11 years expired filled, 02E date code. Kid asked me when I last had it filled and I told him about 6 months ago, it was actually about 8 since it was last December when preparing for our trip down to Florida for Xmas. He said he'd fill out for me since I knew it held pressure but that I was best off exchanging it before my next fill. I think I will but I'll check for a fresh date code on the exchange. My other tank is also expired but by much less time and it's in better shape so I'll probably have it recertified assuming the Amerigas near me does that.