nissez Posted October 21, 2008 Report Share Posted October 21, 2008 Is it posible to run my 65 cad on lead free fule? Link to comment Share on other sites More sharing options...
Marika Posted October 21, 2008 Report Share Posted October 21, 2008 Is it posible to run my 65 cad on lead free fule? Yes, you can use unleaded fuel in your 65 Caddy. Just make sure you use the proper octane rating usually, 93 or better. If you really want to make people safe drivers again then simply remove all the safety features from cars. No more seat belts, ABS brakes, traction control, air bags or stability control. No more anything. You'll see how quickly people will slow down and once again learn to drive like "normal" humans. Link to comment Share on other sites More sharing options...
dgaouette Posted October 21, 2008 Report Share Posted October 21, 2008 Put the additive in or you will need to change your valve guides. Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 21, 2008 Report Share Posted October 21, 2008 My 74 Eldo 500 ci took leaded fuel, I pulled the heads and had hardened valve guides installed so it could use unleaded. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
KHE Posted October 21, 2008 Report Share Posted October 21, 2008 The early 70's engines could be run on no-lead fuel as the manufacturers were already prepared for lead-free fuel. I doubt that was the case for your 1965 engine. I would add the lead substitute additive. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
JimD Posted October 21, 2008 Report Share Posted October 21, 2008 I remember it being the valve seats that had to be replaced. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
JohnnyG Posted October 22, 2008 Report Share Posted October 22, 2008 Yes, seats and new valves, since the faces would errode after time. I'd say it depends on how you're going to drive it. If it's for parade use, or classic car shows, you should be fine for a long time. If you're going to head it across country, you'd better opt for as many lead type substitutes that you can find. Sorry, I threw my last bottle away about two weeks ago. Never underestimate the amount of a persons greed. Link to comment Share on other sites More sharing options...
Ranger Posted October 22, 2008 Report Share Posted October 22, 2008 I remember it being the valve seats that had to be replaced. Yup, valve seats not guides. Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 22, 2008 Report Share Posted October 22, 2008 I remember it being the valve seats that had to be replaced. Hmm, I recalled it to be the valve guides, maybe they replaced the seats, and they replaced my guides as they needed replacing, according to this article its seats as you said http://answers.yahoo.com/question/index?qi...29105540AA1zCg1 Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Texas Jim Posted October 22, 2008 Report Share Posted October 22, 2008 Is it posible to run my 65 cad on lead free fule? It is my understanding that the TETRAETHYL LEAD in leaded fuel acts as a cushion between the valve and the valve SEAT. Without lead, the VALVE and the valve SEAT bangs together every time the valve closes. Since, obviously, unleaded fuel does not have the lead to act as a cushion, you need to use a lead SUBSTITUTE to do the same thing the lead did and prevent eventual damage to the engine. Like cracked valve seats or possible a broken valve. Both of which are known as VERY BAD THINGS. Just my 2 cents.... for what it's worth. Link to comment Share on other sites More sharing options...
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