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Old 01-19-2017, 07:56 AM   #1
BlueScooby
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Join Date: Jan 2001
Chapter/Region: NESIC
Location: Lawrence, MA
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2017 WRX 6MT
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Default Mobil gas

Anyone else find that mobil 93 is complete garbage in NE?

Both my BRZ and WRX knock on it even when bought from different stations. I'm not sure if its an octane issue or a detergent they are using but both cars are tuned to perfection and literally do not knock on anything but mobil gas. Interested to see if anyone else has experienced the same thing.
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Old 01-19-2017, 12:13 PM   #2
Mheard
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Might not be the quality of the gas, but the fact that people aren't purchasing 93 octane from Mobil for whatever reason. Mobil is typically more expense...

When gas sits for an extended period, the octane level can decrease, therefore causing knock. Can't grab any info now; at work, but Google may help.
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Old 01-19-2017, 01:48 PM   #3
cknowlen
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INbe4 someone suggests "just put some octane booster in there"
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Old 01-19-2017, 07:33 PM   #4
Pearl Jam
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Shell V-Power or nothing for my FiST. That's all I have to contribute to this thread...
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Old 01-25-2017, 01:01 PM   #5
MassBugeye
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+1 for Shell and/or Sunoco.

As far as octane boosters go the only one "worth" it is Torco. Leave a bottle in your car and use some if you experience knock events.
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Old 01-26-2017, 04:09 PM   #6
Samurai Jack
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Quote:
Originally Posted by BlueScooby View Post
Anyone else find that mobil 93 is complete garbage in NE?

Both my BRZ and WRX knock on it even when bought from different stations. I'm not sure if its an octane issue or a detergent they are using but both cars are tuned to perfection and literally do not knock on anything but mobil gas. Interested to see if anyone else has experienced the same thing.
Maybe it's not the gas but the gas station you use.
- leaky tanks
- station buys scrap gas from anyone to save money and increase profit
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Old 01-27-2017, 02:45 PM   #7
BlueScooby
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Yeah, I've never had an issue with shell or sunoco. Miss the ultra 94 =/

@samurai jack - I wish it was just one station but it is multiple mobils all over new england over the course of 5 years and they supply their own gas.

All I can think of is that some additive in their gas slightly raises the flashpoint or something creating the potential for detonation.

I guess aside from getting a sample from every station and sending it to a lab, I'll probably never know =/
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