E85 and fuel treatments

ZStalker505 · 02-19-2025, 12:10 PM

Every so often I seem to dive into forums and read about fuel additives for those that run flex fuel. I usually have my E between 40 and 70. Its never seen lower than about E34. Been throwing Lucas E treatment every other tank or so because since I don't drive my car much it tends to sit, usually cruise around 1 or 2 times a week. I live in the SW so don't have high humidity.

Some swear nothing is needed but I tent to error on the side of caution with this car since so much money is in it. What are your thoughts on additives for vehicles that run higher E? Lucas, Star Brite Star Tron, Power Plus top lube?

Fuel related I have ID 1300s, Aero return system mesh filter, CJM top hat, maxed out walbro 450, JMS Powermax Fuel max

Spooler · 02-19-2025, 05:01 PM

I don't run any additive. You don't need a thing. Car sitting for a couple weeks is no big deal. One thing not to do is mix pump gas and E85. You can run the tank out of pump gas and then switch over to E85. That's not a big deal. But, mixing them is a bad idea. That is how you get the jelly crap in the fuel system. I run out of the barrel these days since I work from home.

Elmo370z · 02-20-2025, 12:45 PM

This. Or just put 93 in the car if it’s going to sit

ihaveashihtzu · 02-28-2025, 02:30 AM

I ran E85 straight for 2 years without any additives or regular pump gas. The car developed a misfire that would occasionally show up but not cause any noticeable performance issues.

When I went to change my valve cover gaskets, I got a chance to inspect the intake valves and they were all gummed up. I've since started to run pump gas every few tanks of e85.

nis350 · 03-04-2025, 09:12 PM

Quote:

Originally Posted by ihaveashihtzu

I ran E85 straight for 2 years without any additives or regular pump gas. The car developed a misfire that would occasionally show up but not cause any noticeable performance issues.

When I went to change my valve cover gaskets, I got a chance to inspect the intake valves and they were all gummed up. I've since started to run pump gas every few tanks of e85.

Looks like some kind of oil substance.

Spooler · 03-04-2025, 09:21 PM

Ugg, Pump E85. I run out of the barrel. Ignite Red or Ethanol One R.

Spooler · 03-04-2025, 09:22 PM

Quote:

Originally Posted by nis350

Looks like some kind of oil substance.

Yup, you have to run a good set of catch cans with E85. That looks like oil.

Tractionless · 03-16-2025, 08:01 AM

Quote:

Originally Posted by Spooler

Yup, you have to run a good set of catch cans with E85. That looks like oil.

100%!! That's beyond an E85 problem as it typically cleans everything in the engine and thus looks new!

SG4247 · 03-16-2025, 10:39 AM

I’ve run 100% methonal (carb and injection) and E85 forever.

The catch can, or vacuum pump is really required for either fuel.

You just have more water vapor build up in the crankcase that needs to be removed while the engine is warming up.

I let my 370 sit for two years full of E85, and then took it to the track and ran my PB on the same old tank of fuel. Now, I don’t ever let alcohol based fuels sit open to the air or they will go bad.

We used lube additives for 100% alcohol, but on E85, I haven’t seen a need for it.

02-19-2025, 12:10 PM	#1 (permalink)
ZStalker505 Base Member Join Date: Jan 2023 Location: NM Posts: 192 Drives: 14 SC Nismo Rep Power: 3	E85 and fuel treatments Every so often I seem to dive into forums and read about fuel additives for those that run flex fuel. I usually have my E between 40 and 70. Its never seen lower than about E34. Been throwing Lucas E treatment every other tank or so because since I don't drive my car much it tends to sit, usually cruise around 1 or 2 times a week. I live in the SW so don't have high humidity. Some swear nothing is needed but I tent to error on the side of caution with this car since so much money is in it. What are your thoughts on additives for vehicles that run higher E? Lucas, Star Brite Star Tron, Power Plus top lube? Fuel related I have ID 1300s, Aero return system mesh filter, CJM top hat, maxed out walbro 450, JMS Powermax Fuel max Last edited by ZStalker505; 02-19-2025 at 12:16 PM.

02-19-2025, 05:01 PM	#2 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,988 Drives: 2013 Nismo 370z Rep Power: 2684392	I don't run any additive. You don't need a thing. Car sitting for a couple weeks is no big deal. One thing not to do is mix pump gas and E85. You can run the tank out of pump gas and then switch over to E85. That's not a big deal. But, mixing them is a bad idea. That is how you get the jelly crap in the fuel system. I run out of the barrel these days since I work from home. ZStalker505 likes this.

02-20-2025, 12:45 PM	#3 (permalink)
Elmo370z A True Z Fanatic Join Date: Apr 2013 Location: st. petersburg Posts: 5,724 Drives: 09 nissan 370z Sp M6 Rep Power: 295378	This. Or just put 93 in the car if it’s going to sit Optimiser, sx moneypit and ZStalker505 like this.

02-28-2025, 02:30 AM	#4 (permalink)
ihaveashihtzu Base Member Join Date: Jun 2018 Location: Sacramento Posts: 34 Drives: 08 G35, 11 370 Nismo Rep Power: 45	I ran E85 straight for 2 years without any additives or regular pump gas. The car developed a misfire that would occasionally show up but not cause any noticeable performance issues. When I went to change my valve cover gaskets, I got a chance to inspect the intake valves and they were all gummed up. I've since started to run pump gas every few tanks of e85. ZStalker505 likes this.

03-04-2025, 09:21 PM	#6 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,988 Drives: 2013 Nismo 370z Rep Power: 2684392	Ugg, Pump E85. I run out of the barrel. Ignite Red or Ethanol One R. Tractionless likes this.

03-16-2025, 10:39 AM	#9 (permalink)
SG4247 Track Member Join Date: Oct 2016 Location: OKC Posts: 806 Drives: 2010 touring Rep Power: 7842	I’ve run 100% methonal (carb and injection) and E85 forever. The catch can, or vacuum pump is really required for either fuel. You just have more water vapor build up in the crankcase that needs to be removed while the engine is warming up. I let my 370 sit for two years full of E85, and then took it to the track and ran my PB on the same old tank of fuel. Now, I don’t ever let alcohol based fuels sit open to the air or they will go bad. We used lube additives for 100% alcohol, but on E85, I haven’t seen a need for it. ZStalker505 likes this. __________________ NA on E85 - 12.402 @ 112 mph 100 shot E85 - 11.589 @ 117 mph JWT C2 cams rev Base Circle & Titan Valves

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