Guest 51Special Posted March 12, 2011 Share Posted March 12, 2011 Sorry if I ask a lot of questions but you guys (or gals) are fantastic.This may be a rookie question , but that's what I am.Will my 39 Dodge need lead substitute or something to run properly on today's gas?If so, what brands are recommended? Link to comment Share on other sites More sharing options...
Rusty_OToole Posted March 12, 2011 Share Posted March 12, 2011 No lead substitute or other substance required. When your car was built lead content and octane ratings were low. Your engine is equipped from the factory with hardened valve seat inserts just like the ones being installed to update old motors today.Hi test gas was 75 octane or thereabouts, regular 60 to 65. The cheapest regular you can buy today is 87 octane so it is better than the hi test of 1939If you like you can add a jigger of Redex, Marvel Mystery Oil, Bardahl or your favorite brand of upper cylinder lubricant to each tank of gas. It can't hurt and it might help.Also, it is important to add fuel stabilizer if you don't drive the car very much. Today's gas can go sour in as little as 6 months. Link to comment Share on other sites More sharing options...
Guest Honolulu Dick Posted March 12, 2011 Share Posted March 12, 2011 Highly recommend you read the thread titled Marvel Mystery Oil, posted 2-days ago.RustyOT gave us a an excellent lesson pertaining to your question. Link to comment Share on other sites More sharing options...
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