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What gas do pre-1974 LEADED gas cars run? #5362669 02/28/20 06:50 PM
Joined: Dec 2014
Posts: 78
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wowthisexists Offline OP
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Joined: Dec 2014
Posts: 78
Can't get leaded gas no more
so what do LEADED cars use for gas?

Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362671 02/28/20 06:53 PM
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kschachn Offline
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Joined: Dec 2005
Posts: 13,911
Did this just happen?


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362675 02/28/20 07:00 PM
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whatnext Offline
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I thought there was an additive you can put in unleaded gas to run it in old cars.

Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362677 02/28/20 07:01 PM
Joined: Oct 2004
Posts: 10,193
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bullwinkle Online Confused
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Joined: Oct 2004
Posts: 10,193
Hot tub time machine? Guess they suck it up and use unleaded? I guess avgas or racing fuel is an option, or I've heard there are leaded gas additives.


06 Ram 3500 CTD 4X4(FG Venturi), 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7 (MC), 03 Merc Grand Marquis 4.6 2V(XG2), 11 Express 3500 6.0 (Fram PH10060 for now)
Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362682 02/28/20 07:05 PM
Joined: Jul 2013
Posts: 1,994
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jhellwig Offline
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Unicorn tears and ground smurfs.

How is this still a question after 46 years?


Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2014 Toyota Sienna
1983 Chevy K5 350
Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362686 02/28/20 07:12 PM
Joined: Jul 2010
Posts: 253
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brentalan Offline
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I run AVGas (100LL) in my 1970 Mercury. With compression of 11.3:1, I get pinging if I try to use 93.

Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362697 02/28/20 07:39 PM
Joined: Jun 2002
Posts: 2,676
Bud Offline
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To get you by the abundance of sarcasm, just use regular unleaded and don't t lose any sleep over it. I have had many old British sports cars over the years and they did fine. There are additives out there if you feel it necessary.


2016 Honda Pilot EX-L with NAVI.....Mobil 1 0w20 AFE and Honda OEM Filter
Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362703 02/28/20 07:45 PM
Joined: Apr 2010
Posts: 4,496
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atikovi Online Content
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OP, you been doin time in the slammer the last 30 years?

Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362714 02/28/20 07:50 PM
Joined: Oct 2014
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CT8 Offline
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Unleaded gas.


2015 F150 2.7
2018 F350 6.2
Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362715 02/28/20 07:51 PM
Joined: Sep 2012
Posts: 5,691
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DBMaster Offline
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I drove a 1972 Pontiac for years back in the 80's. Anything from GM was already designed to run on unleaded fuel by then. (hardened valve seats)

Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362716 02/28/20 07:51 PM
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PowerSurge Offline
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Rip van Winkle, is that you? smile I run Hapco lead substitute in my old cars.


1993 Porsche 964, 2001 Ford SVT F-150 Lightning, 2004 Chevrolet Corvette, 2018 Toyota Tundra and a few others
Re: What gas do pre-1974 LEADED gas cars run? [Re: jhellwig] #5362718 02/28/20 07:52 PM
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Posts: 14,751
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CT8 Offline
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Originally Posted by jhellwig
How is this still a question after 46 years?
Time certainly flies.


2015 F150 2.7
2018 F350 6.2
Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362726 02/28/20 07:56 PM
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Marco620 Offline
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https://www.redlineoil.com/lead-substitute

Would recommend non ethanol fuel too


15' Civic 1.8 i-vtec 319,500 mi M1 0w30 & LG Biotech,Castrol CVT Fluid,GUMOUT/ PEA
Doberman Whisperer! HondaGuru.
E pluribus unum.

Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362784 02/28/20 09:04 PM
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Dinoburner Offline
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Need more info, year of vehicle, engine etc. Back in the day Amoco recommended 4oz. of top oil each fill up. MM will suffice. Also this topic has been discussed before on BITOG.


77 Chev stepside 454 Casteroil syn
95 GMC 4wd mobil syn
2016 Equinox LTZ V6 dealer
Kubota L5030 T6
Re: What gas do pre-1974 LEADED gas cars run? [Re: wowthisexists] #5362817 02/28/20 09:42 PM
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sloinker Offline
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1972 and later models have the hardened valve seats iirc. Valve recession is real for earlier engined vehicles and a lead substitute or AVgas should be used. You could just run unleaded until you lose a valve and then remove the heads and have hardened exhaust seats installed.


'16 Tiguan TSI Vaico 5W40
'15 VW Golf TDI Ravenol VMP 5W30
'15 VW Golf Sportwagen TDI VMP 5W30
'14 Dodge Grand Caravan 3.6 Red Line Blue Label 5W20
'64 Plymouth Fury440 Red Line Blue Label 10W40
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