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ted sweet

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  1. if it isnt ping using super unleaded is pointless, it also as no more additives to help with valve recesiion

    <div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">DaveZZZ, that was an excellent and concise discussion of modern fuel. Thank you. I know for my own understanding, it was of great help.

    I would like to add, if you use the Lead Supreme Tetraethal additive, you most likely will not pass emission tests in those States that still require it. However, I have found the Non-lead additives to work well. But the point has been made, and correctly so, that to buy Regular, then adding an additive, you might as well buy Supreme, and may still have to add a Non-lead additive.

    My understanding of the Hardened Valve Seats in older engine rebuilds was to prevent damage from pre-ignition knock. Tetraethal was added to fuel in the 1940s to prevent that annoying 'ping' and it worked. It was also cheap so the oil companies like Standard Oil had no problem adding it following the commercial success of the Ethal Oil. Most fuels were non-lead fuels at base until the companies began experimenting with fuel additives to boost performance, and silent running of engines. According to older family members, it was normal for engines to 'ping', stall, and overheat causing vapor lock. Summer and vacations to the mountains were often exciting adventures as the old Merc or DeSoto would chug and stall its way across the Badlands to the Rocky Mountains.

    So I guess the answer is to just bite the bullet, and buy the top grade. Buying the middle grade is pointless, and Regular may cause damage or at least poor performance. Coupled with modern oils that have reduced ZDDP, and you are looking at potential problems with lifters and valves, if they are not of the Roller Type. And, Dave's point about old rubber seals is a good point. They should be replaced with modern rubber or its equivalent that is made for the modern fuels.

    Good thread. Thanks, Guys. </div></div>

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