Good Question

usma41 · Post by **usma41** » Tue Dec 19, 2006 5:58 pm

Has anyone any Idea what effect unleaded fuel is having on these old engens?

Post by **wesk** » Tue Dec 19, 2006 9:00 pm

These old engines were designed to function on 65 octane elephant urine.

Unless a guy tricks out his engine to turn 5000 + RPM and jacks the compression way up there's no real problem with the lack of lead in todays 80/87 octane mogas.

The real problem with todays fuels is their additive's effects on the NOS old style rubber components floating around.

TOM-R · Post by **TOM-R** » Tue Dec 19, 2006 10:17 pm

lead substitute is cheap and comes in a plastic container like stabil with the measuring cup molded in, wheather or not you truly need it depends on who you talk to but it is so cheap it is not worth it not to use it, imho

Post by **wesk** » Tue Dec 19, 2006 11:18 pm

Lead substitues are like Marvel Mystery Oil, everyone swears by it but no one offers any factual support for it.

We're talking 4 cylinders, 6.5 compression ratios, 2500 RPM and 45 to 50 mile an hour here! Not 10 to 1 compression , 7,000 RPm , 160 MPH V8's.

I'm getting 100,000 miles out of an F134 with unleaded gas and 10W30 oil for the last 15 years and if it doesn't come out of the pump hose I don't waste time trying to squeeze it out of a bottle.

Ryan · Post by **Ryan** » Tue Dec 19, 2006 11:23 pm

[quote]I'm getting 100,000 miles out of an F134 with unleaded gas and 10W30 oil for the last 15 years and if it doesn't come out of the pump hose I don't waste time trying to squeeze it out of a bottle.

[quote]

So you use 10W30 in your engines? I replaced the 10W30 oil in mine for SAE30. Is the 10W a better choice?

Post by **wesk** » Tue Dec 19, 2006 11:25 pm

It is up here in Wisconsin with the fluctuations in temps from "0" to 60 over the last two months. 30 is used in the summer.

usma41 · Post by **usma41** » Wed Dec 20, 2006 5:54 am

I understand that the additive's are a pain in the ass because you use it once, you have to keep useing it. No thanks.

OKCM38CDN · Post by **OKCM38CDN** » Wed Dec 20, 2006 7:39 am

I use fuel straight out of the pump. like Wes... Drive it regularly with no problems. Oil is 10W30 or 40 depending on the winter/summer...

Temps here in OKlahoma can be from 0 to 110 depending on the season and the will of Mother Nature...

Drove the jeep to the BX on the base yesterday... in the rain with no top, ran like a top...