Wrong octane level

ChrisNich117 · 03-05-2015, 09:17 AM

So first of all, I selected the correct premium gas at a Shell the other day but I had to park on a funny angle because of the guy behind me and when I whipped the hose around it must have slapped the 89 octane button. I had a tank that was 1/3 full of 93 and my mechanic told me that the knock sensor would regulate the ignition or whatever it is that keeps it from exploding lol. Any one screw up like this before and think it's more serious? I figured since I already had a good amount of the 93 I'd be comfortably situated somewhere around the crappy California 91 quality. In Europe I use the Shell V power race or whatever they call it which is 100 RON and I think the equivalent of 95 octane. That's probably why I'm so worried in trusting the quality. Don't know much about the chemical composition of these fuels so I'm just curious. Thanks!

MCarsFan · 03-05-2015, 09:29 AM

You could buy a bottle of octane booster from a performance shop to up your octane safely for this tank.

ChrisNich117 · 03-05-2015, 09:30 AM

Quote:

Originally Posted by MCarsFan

You could buy a bottle of octane booster from a performance shop to up your octane safely for this tank.

I've never used one. Which product would you recommend?

Spinny02 · 03-05-2015, 10:38 AM

I would not worry about it. Octane booster should help.

Bönz · 03-05-2015, 10:53 AM

If you went 1/3 at 93 and 2/3 at 89, then you're at about 90.3. I wouldn't worry about it. The ECM will dial back ignition, boost and cam if it must to control pre-ignition (knock). Just don't race in the meantime, take it easy for 1/2 a tank and then top off with 93 to bring it back to 91.5ish. More than enough.

bronch · 03-05-2015, 06:00 PM

Here's a link to thread where someone put 87 in the tank. Apparently, no problems.

03-05-2015, 09:17 AM	#1
ChrisNich117 First Lieutenant 129 Rep 395 Posts Drives: '14 F10 M5 Alpine White ZCP Join Date: Jan 2013 Location: Bradenton Florida iTrader: (0) Garage List 2009 e92 M3 coupe [0.00] 2013 F10 M5 [0.00]	Wrong octane level So first of all, I selected the correct premium gas at a Shell the other day but I had to park on a funny angle because of the guy behind me and when I whipped the hose around it must have slapped the 89 octane button. I had a tank that was 1/3 full of 93 and my mechanic told me that the knock sensor would regulate the ignition or whatever it is that keeps it from exploding lol. Any one screw up like this before and think it's more serious? I figured since I already had a good amount of the 93 I'd be comfortably situated somewhere around the crappy California 91 quality. In Europe I use the Shell V power race or whatever they call it which is 100 RON and I think the equivalent of 95 octane. That's probably why I'm so worried in trusting the quality. Don't know much about the chemical composition of these fuels so I'm just curious. Thanks!
	Appreciate 0 Tweet Quote

03-05-2015, 09:29 AM	#2
MCarsFan Lieutenant Colonel 363 Rep 1,805 Posts Drives: 2014 BMW M5 F10 CP Join Date: Apr 2013 Location: Dallas, Texas iTrader: (0) Garage List 2014 BMW F10 M5 [10.00]	You could buy a bottle of octane booster from a performance shop to up your octane safely for this tank.
	Appreciate 1 Quote

03-05-2015, 10:38 AM	#4
Spinny02 Lieutenant Colonel 124 Rep 1,840 Posts Drives: '14 M5 CP Dinan Stage 2 Join Date: Jun 2013 Location: Houston, Tx iTrader: (2) Garage List 2018 Escalade ESV P ... [0.00] 2014 M5 Dinan S1 [0.00]	I would not worry about it. Octane booster should help. __________________
	Appreciate 0 Quote

03-05-2015, 10:53 AM	#5
Bönz Captain 184 Rep 764 Posts Drives: 2018 M5 Join Date: Jan 2012 Location: Michigan iTrader: (0)	If you went 1/3 at 93 and 2/3 at 89, then you're at about 90.3. I wouldn't worry about it. The ECM will dial back ignition, boost and cam if it must to control pre-ignition (knock). Just don't race in the meantime, take it easy for 1/2 a tank and then top off with 93 to bring it back to 91.5ish. More than enough.
	Appreciate 1 Quote

03-05-2015, 06:00 PM	#6
bronch Waiting for the sun 66 Rep 704 Posts Drives: 2018 M240ix Join Date: Oct 2006 Location: Tacoma, WA iTrader: (0)	Here's a link to thread where someone put 87 in the tank. Apparently, no problems. __________________ 2012 E92 M3- Miss her. 2015 F10 M5- Land yacht, but miss her too! 2016 991.1 GT3- Woohoo! 2018 M240ix- Daily driver. Still Woohoo!
	Appreciate 0 Quote