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I would have to agree with Oldopelguy. I've beenrunning a lead additive from CD-2 ever since I got into Opel GTs 13 years ago and I've never had a problem with valve recession. In Vickie's 69 GT she even runs 93+ octane gas. In my 72 GT it doesn't seem that the octane rating is an issue, but it does get the CD-2 additive at each fill-up.
 
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