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gas and additives #1337070 Mon Dec 09 2019 06:04 PM
Joined: Dec 2018
Posts: 4
bobbynudd Offline OP
New Guy
I have a 1951 gmc 3/4 ton pickup with a 228 6 cylinder. what should I do about gas type. Is regular gas ok or do i need an additive? If so what .
At present I am using MO gas (aviation gas with no ethanol). thank you

Re: gas and additives [Re: bobbynudd] #1337114 Mon Dec 09 2019 11:14 PM
Joined: Mar 2010
Posts: 8,850
52Carl Offline
Master Gabster
I run 87 octane. It works very well.

Re: gas and additives [Re: bobbynudd] #1337117 Mon Dec 09 2019 11:22 PM
Joined: Apr 2005
Posts: 8,116
Justhorsenround Offline
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
No ethanol is best but that comment usually starts a big debate. It’s been beat to death on the site. Do a Stovebolt search and be prepared for an evenings reading.

'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe

"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line" and lock up those on the wrong side of that line.

Re: gas and additives [Re: 52Carl] #1337127 Tue Dec 10 2019 12:21 AM
Joined: Jan 2002
Posts: 2,012
cmayna Offline
Shop Shark
Originally Posted by 52Carl
I run 87 octane. It works very well.
Me too, running a '63 235 in my truck.

Craig's '50 Chevy 3100 5 window
My truck
If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
Re: gas and additives [Re: bobbynudd] #1337128 Tue Dec 10 2019 12:28 AM
Joined: Jul 2000
Posts: 821
Gord&Fran Offline
Shop Wrasse
87 octane gas (10% ethanol) purchased August 18. Drove it today - idled a bit rough - needed a bit more choke but it ran OK.

1954 1/2 ton 235 4 speed
Re: gas and additives [Re: bobbynudd] #1337137 Tue Dec 10 2019 01:04 AM
Joined: Apr 2005
Posts: 52
greenie-reddy Offline
Wrench Fetcher
My ‘46 gmc with its 228 likes 89 octane, NO ethanol gas. I drive a few miles into south Central PA to find it. For your area, check out pure
Ethanol is a bad deal on many fronts, but once you dump it in your antique motor vehicle, nothing good happens.

Re: gas and additives [Re: bobbynudd] #1337150 Tue Dec 10 2019 02:28 AM
Joined: Jun 2011
Posts: 3,101
EdPruss Online
Shop Shark
Octane was way below 87 or 85 when our trucks were new. Whatever the lowest grade at the pump is adequate, anything. Higher is just a waste of money. No alcohol is best, 100 low lead adds more lead than we need, probably not legal if anyone is looking. 80 octane avgas, if one can find it, is OK.

NO alcohol is best.


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
Re: gas and additives [Re: bobbynudd] #1337163 Tue Dec 10 2019 03:02 AM
Joined: Sep 2011
Posts: 583
BC59 Offline
Shop Shark
Running on ethanol blend & leaving a rig to set with in in the system very different. The only non-ethanol you can by in Oregon premium / high octane so I run the 87 E10 but purge & put non ethanol in for the winter when rigs will only be run a few times.

1960 Chevy C10 driver
1949 GMC 250 project in waiting
G.M dealer tech since 1980 & counting
Re: gas and additives [Re: bobbynudd] #1337829 Mon Dec 16 2019 08:20 AM
Joined: Dec 2014
Posts: 574
miraclepieco Offline
Shop Shark
Ethanol is hydrophilic - attracts water from the atmosphere - and shouldn't be used in vehicles that sit for prolonged periods. This is why ethanol gas is not allowed for use in aircraft.

Here is a list of non-ethanol fuel sources state-by-state:

1951 Chevy Panel Truck

Moderated by  Justhorsenround 

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