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Old 02-14-2012, 06:07 PM   #1
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1958 3b leaded gas?

Should I be putting a lead supplement in every tank of gas or does the valve seal not need it

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Old 02-14-2012, 06:11 PM   #2
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i dont have a dead on answer for you, but i know of a 1948 cj2a that was run all summer last summer on no lead fuel. no noticable damage but who knows over time what could happen.

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Old 02-14-2012, 06:27 PM   #3
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I haven't been able to find info on it. I've been using it just incase
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Old 02-14-2012, 06:34 PM   #4
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keep us updated! a buddy and i are going to start a 58' restore.the yellow one was last years project.
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Old 02-14-2012, 06:46 PM   #5
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If your machinist installed hardened exhaust valve seats, you're fine to go with unleaded fuel. If not, add the lead additive. If you are not sure, add the lead.

A few years back, the EPA removed the zinc from engine oil. Zinc is required for the proper lubrication of the flat tappet lifters in the 134F. Lucas oil carries a break-in oil additive with zinc and it only takes 4 ounces per oil change.
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Old 02-14-2012, 07:02 PM   #6
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So I need an additive for the oil?
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Old 02-14-2012, 07:24 PM   #7
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Yes, you definitely need a zinc additive for the oil and possibly a lead fuel additive depending on how your engine may have been rebuilt if it has been rebuilt. Sorry, my last post wasn't the most clear.
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Old 02-14-2012, 07:28 PM   #8
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Well I wasn't sure if I needed the lead but I'm sure if it was rebuilt so I'll just use it anyways. I totally forgot about the zinc but I did have to use that additive in another car (69 ford fairlane) for the same reason thanks for reminding me.
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Old 02-14-2012, 07:32 PM   #9
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Just order chinese gas; you'll be fine...
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Old 02-14-2012, 08:03 PM   #10
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Haha
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Old 02-14-2012, 08:14 PM   #11
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You can get oil from NAPA that is made for older engines with zinc. I can't recall what it is, but I put it in my 1930 Marquette...It's on the shelf at my local NAPA, but I know it is made for pre-1960 engines...more zinc, etc. The engine in my '30 was rebuilt in the early '70's, so I don't take any chances...it runs like a top and holds good pressure (40 psi).

I use the pre-SM rated oil in my 1972 cj5. Just my own piece of mind, since the 304 is the original from 1972. I've had the cam and main bearings replaced, but that is about it. Not a full rebuild as it was clean.

As for the lead additive, I use it in my '30 every other tank. I don't drive it more than 60 miles a year, so it won't make a major difference. Only thing is that the ethanol in fuel today ruins old school mechanical fuel pumps and diaphragms. Had a tech notice from Buick on this matter...new fuel wreaks havoc on the older iron in more than one way...lots of corrosion and rust from the fuel condensing...

Here is a nice rating chart for years of oil and vehicleshttp://www.upmpg.com/motor_oil_rate_gas.htm

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