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01-26-2009, 12:55 PM	#1
Bill Pomponi Member Join Date: Sep 2004 Location: North Granby, Connecticut Posts: 212 Likes: 0 Liked 0 Times in 0 Posts	Classic Car Engine Additives ZDDP Additive for Classic Cars with non-roller lifters As I understand the it, the phosphorus has been removed because it plates-out on catalytic converters, causing them to fail. Here is the web site of an additive supplier. http://www.zddplus.com Any comments/suggestions??

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