Fuel additive

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June 26th, 2015, 06:27 AM

67Rocket

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Location: Southern Virginia

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Fuel additive

Do those of you who still run original engines without "hard" valve seats use any additives in your gas? If so, what do you use?

June 26th, 2015, 06:56 AM

oldcutlass

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Location: Poteau, Ok

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No, its not required. The seats don't wear much with todays fuel. You have to remember that the lead was added for the anti-knock characteristics and the bonus benefit was it somewhat coated the seats.

June 26th, 2015, 07:42 AM

D. Yaros

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Location: SE Wisconsin

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I don't often use a fuel additive, but when I do, I use TEL!

June 26th, 2015, 09:00 AM

Ozzie

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Location: S.E. Louisiana, so far still in U.S.A.

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I have four "antiques" with original engines currently. I don't use any fuel additive for the valves and, so far, there have been no valve problems.

June 26th, 2015, 09:04 AM

chip-powell

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Location: Maryland

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No additives for me. I just run 93 octane and have no knocks or problems in the last 2 plus years.

June 27th, 2015, 08:02 AM

sammieolds

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Location: lexington sc

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I never run any additives ,Do you run Enthole free or reg 93 octane
Steve

June 28th, 2015, 04:03 PM

Tedd Thompson

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Location: Forest Ranch Ca.

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I just run pump gas in my 327 Chevy powered Land Cruiser and have from the time we couldn't get leaded fuel sometime in the seventies. Probably 40,000 miles with no problems...Tedd

June 29th, 2015, 08:52 AM

tds

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Location: Katy, Texas

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I used Octane Supreme until I had the engine rebuilt. Not sure it needed it, but I did not have any problems. Since rebuild, I just use 93 at the pump. No problems.

June 29th, 2015, 09:23 AM

pogo69

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Join Date: Mar 2011

Location: CT

Posts: 1,925

driving habits play into this for sure. my take is if your running it hard the valves will sink quicker without that little bit of lead. if your a moderate driver it shouldnt be a problem with unleaded

June 29th, 2015, 10:28 AM

#10

MDchanic

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Join Date: Sep 2010

Location: The Hudson Valley

Posts: 21,183

I use no additive now.

Before I polished the combustion chambers I used Octane Supreme (tetraethyl lead / TEL) to increase the octane, but don't need it now.

- Eric