Put 87 octane by accident

speedmaster20d · 07-26-2019, 01:05 PM

I put about 4-5 gallons of 87 octane gas in m3 by accident, then filled up 10 gallons octane 91. seems to drive fine no warning lights but the engine sound, especially on downshifts is diminished...

should not damage the engine or the catalytic converter right?

ntg44 · 07-26-2019, 01:13 PM

Grab a hose and start siphoning. I recommend toothpaste or mouthwash afterwards.

speedmaster20d · 07-26-2019, 01:19 PM

Quote:

Originally Posted by ntgarage44

Grab a hose and start siphoning. I recommend toothpaste or mouthwash afterwards.

ntg44 · 07-26-2019, 01:24 PM

Quote:

Originally Posted by speedmaster20d

If you feed your baby Taco Bell, expect to get the runs haha.

In all seriousness though, I'm pretty sure OEM tunes compensate for crappy gas. I'd just keep it off boost until the tank is almost done. Hard not to stomp on it, but don't want any problems. Tank is small enough that should empty quickly.

NYG · 07-26-2019, 01:58 PM

You're fine.

You can thank the automotive gods for electronic fuel injection.

87 just combusts under less compression.

BMR DOC · 07-26-2019, 02:02 PM

Drive it like you stole it get that gas out ASAP . LOL
Although I wouldn't do it all the time it will not hurt anything . We have customers that never use 91 and don't have issues

noone · 07-26-2019, 03:27 PM

Sell the car immediately, it will never run the same again.

icegrill · 07-26-2019, 03:32 PM

Grab some 104 octane boost if you want. Ecu adapts for gas quality.

Spun Crankhub · 07-27-2019, 12:34 PM

Contact your insurance, car is totaled.

Bomex · 07-27-2019, 12:42 PM

Same thing happened to me yesterday. I live in NJ and can't pump my own gas. Told the dude 93 several times. Still put in 87. Was pretty pissed off.

yayaya · 07-27-2019, 01:23 PM

Did this with my 911 turbo stock tune once, didn't really notice a difference or have any problems. You should be fine.

G35POPPEDMYCHERRY · 07-27-2019, 01:26 PM

pull over immediately; turn off the engine. take a deep breath...get back in car and act like it never happened

gatorfast · 07-27-2019, 02:45 PM

Quote:

Originally Posted by Bomex

Same thing happened to me yesterday. I live in NJ and can't pump my own gas. Don't the dude 93 several times. Still put in 87. Was pretty pissed off.

The fact that some states require "full service" still blows my mind. I can't imagine someone else pumping gas in my car.

Bomex · 07-27-2019, 02:48 PM

Quote:

Originally Posted by gatorfast

The fact that some states require "full service" still blows my mind. I can't imagine someone else pumping gas in my car.

Turns something that should take 5 minutes max to 10 minutes sometimes. Very annoying.

jailonacs99 · 07-27-2019, 09:37 PM

Uh oh, I think I just saw OP.

verruckt · 07-27-2019, 11:19 PM

Put a can of VP Octanium in it.

You can buy it at Autozone.

Just dont make it a habit of it.

speedmaster20d · 07-31-2019, 01:15 AM

Quote:

Originally Posted by TacoChris

Contact your insurance, car is totaled.

good one

mike@x-ph.com · 07-31-2019, 12:36 PM

Quote:

Originally Posted by speedmaster20d

I put about 4-5 gallons of 87 octane gas in m3 by accident, then filled up 10 gallons octane 91. seems to drive fine no warning lights but the engine sound, especially on downshifts is diminished...

should not damage the engine or the catalytic converter right?

Your fine, just dont push the car until you put 100% 91

chewbakam4 · 07-31-2019, 01:12 PM

Just drive and add 91 when you can

GT_Juls · 07-31-2019, 08:09 PM

Drive in efficient and stay out of boost. Dont hammer it to get rid of the gas. Shit happens so the ecu will compensate.

07-26-2019, 01:05 PM	#1
speedmaster20d First Lieutenant 350 Rep 399 Posts Drives: 21 G80 comp BG. 2018 F80(sold) Join Date: Aug 2014 Location: South Bay iTrader: (0)	Put 87 octane by accident I put about 4-5 gallons of 87 octane gas in m3 by accident, then filled up 10 gallons octane 91. seems to drive fine no warning lights but the engine sound, especially on downshifts is diminished... should not damage the engine or the catalytic converter right? __________________ 2018 M3 Competition SO II : sold 2021 M3 Competition BG
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07-26-2019, 01:13 PM	#2
ntg44 Colonel 2892 Rep 2,147 Posts Drives: R8 4.2 Spyder Join Date: Aug 2018 Location: Chicago iTrader: (3)	Grab a hose and start siphoning. I recommend toothpaste or mouthwash afterwards.
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07-26-2019, 01:58 PM	#5
NYG Brigadier General 10825 Rep 3,714 Posts Drives: Audi R8 Join Date: Feb 2017 Location: Brooklyn, NY iTrader: (0)	You're fine. You can thank the automotive gods for electronic fuel injection. 87 just combusts under less compression.
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07-26-2019, 02:02 PM	#6
BMR DOC New Member 1 Rep 12 Posts Drives: E46 touring Join Date: May 2018 Location: sf bay iTrader: (0)	Drive it like you stole it get that gas out ASAP . LOL Although I wouldn't do it all the time it will not hurt anything . We have customers that never use 91 and don't have issues
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07-26-2019, 03:27 PM	#7
noone Second Lieutenant 201 Rep 277 Posts Drives: 2018 M3 ZCP Join Date: Apr 2017 Location: Florida iTrader: (0)	Sell the car immediately, it will never run the same again.
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07-26-2019, 03:32 PM	#8
icegrill Lieutenant Colonel 2078 Rep 1,780 Posts Drives: 2015 M3 Join Date: Jan 2018 Location: Oregon iTrader: (3)	Grab some 104 octane boost if you want. Ecu adapts for gas quality.
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07-27-2019, 12:34 PM	#9
Spun Crankhub Major General 965 Rep 5,033 Posts Drives: 15 F82 SOLD Join Date: Feb 2012 Location: San Jose, CA iTrader: (63)	Contact your insurance, car is totaled.
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07-27-2019, 12:42 PM	#10
Bomex Second Lieutenant 38 Rep 244 Posts Drives: BMW X4 N55 Join Date: Jun 2007 Location: NJ/NYC iTrader: (0)	Same thing happened to me yesterday. I live in NJ and can't pump my own gas. Told the dude 93 several times. Still put in 87. Was pretty pissed off. Last edited by Bomex; 07-27-2019 at 02:47 PM..
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07-27-2019, 01:23 PM	#11
yayaya Second Lieutenant 104 Rep 263 Posts Drives: BMW 335xi E92 N55 Join Date: Dec 2016 Location: Midwest iTrader: (0)	Did this with my 911 turbo stock tune once, didn't really notice a difference or have any problems. You should be fine.
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07-27-2019, 01:26 PM	#12
G35POPPEDMYCHERRY Banned 4999 Rep 4,139 Posts Drives: F80 Join Date: Dec 2015 Location: Philadelphia iTrader: (1)	pull over immediately; turn off the engine. take a deep breath...get back in car and act like it never happened
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07-27-2019, 09:37 PM	#15
jailonacs99 Captain 484 Rep 793 Posts Drives: 2022 M4 xDrive Competition Join Date: May 2014 Location: Mid-Atlantic iTrader: (2) Garage List 2022 BMW M4 MxDrive ... [0.00]	Uh oh, I think I just saw OP. Attached Images
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07-27-2019, 11:19 PM	#16
verruckt First Lieutenant 108 Rep 313 Posts Drives: F82 M4, G05 X5, Gen 2 Raptor Join Date: May 2015 Location: Florida iTrader: (0)	Put a can of VP Octanium in it. You can buy it at Autozone. Just dont make it a habit of it.
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07-31-2019, 01:12 PM	#19
chewbakam4 Major 717 Rep 1,184 Posts Drives: F82 M4 Join Date: Oct 2015 Location: Malton iTrader: (0)	Just drive and add 91 when you can
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07-31-2019, 08:09 PM	#20
GT_Juls First Lieutenant 252 Rep 311 Posts Drives: G82 M4 Join Date: Apr 2019 Location: New Jersey iTrader: (0)	Drive in efficient and stay out of boost. Dont hammer it to get rid of the gas. Shit happens so the ecu will compensate. __________________ //M is awesome
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